Some of these monuments have disappeared entirely, such as the Church of the Holy Apostles. Others survive only as ruins. But many still stand today, either as mosques, museums, or active places of worship, continuing to shape the city’s landscape more than a thousand years after they were built.

To understand these churches, it is important to begin with their origins.

The earliest Christian churches of Constantinople were inspired by the Roman basilica — a rectangular structure originally used for public gatherings rather than religious ceremonies. Following the Edict of Milan in 313, when Christianity was legalized by Emperor Constantine, these basilicas were gradually transformed into spaces of worship.

Over time, this architectural tradition evolved.

From the vast domed spaces of the 6th century to the more refined and intimate structures of the Middle and Late Byzantine periods, each church reflects a different phase in the development of the city. Together, they form a layered narrative of how Constantinople adapted, expanded, and redefined itself across centuries.

This guide brings together 15 of the most important Byzantine churches in Istanbul — some monumental, some hidden, but each offering a distinct perspective on the city’s past.

Byzantine Churches in Istanbul (2026)

Many Byzantine churches of Constantinople still survive in present-day Istanbul, although their condition and function vary significantly.

Some, such as the Stoudios Monastery and the Church of St. Polyeuktos, have been reduced to partial remains and are not accessible as complete structures. Others, like the Church of the Holy Apostles, have been entirely lost.

At the same time, a large number of churches continue to exist within the urban fabric of the city.

Some function as mosques, preserving their architectural form while serving a new role. Others operate as museums or mixed-use spaces, where Byzantine mosaics and frescoes can still be observed. A few, such as the Church of St Mary of the Mongols, have remained in continuous use as churches.

The following sections present these monuments individually, offering a clear and structured overview of their history, architecture, and present-day condition.

1. Church of the Holy Apostles

When Constantine chose Byzantium as the new capital of the Roman Empire, he was not simply building a city — he was shaping a new identity. Alongside monuments like the Hippodrome and the Great Palace, the Church of the Holy Apostles became one of the key symbols of Constantinople’s Christian character.

Originally built in the 4th century and later rebuilt by Emperor Justinian after the Nika Revolt of 532, the church was described as one of the most magnificent structures of its time. Contemporary sources mention a vast domed basilica, its roof covered with bronze plates that shimmered like gold, and an interior lined with richly colored marble rising toward the ceiling.

More importantly, this was not just a church.

It was the imperial mausoleum of Byzantium.

For centuries, emperors such as Constantine and Justinian were buried here, making it one of the most sacred and politically significant sites in the city. While Hagia Sophia represented the spiritual heart of Constantinople, the Church of the Holy Apostles embodied the continuity and prestige of the imperial dynasty.

Architecturally, the church also left a lasting legacy. Its cross-shaped plan crowned with multiple domes later inspired major buildings in the Mediterranean world, most notably St. Mark’s Basilica in Venice.

However, the fate of the church reflects the turbulent history of the city itself.

During the Fourth Crusade in 1204, the church was heavily looted and damaged. Imperial tombs were opened, and their contents were plundered — an event frequently mentioned in both historical sources and modern discussions about the period.

By the time the Ottomans conquered Constantinople in 1453, the structure was already in a state of decline. Although it was briefly assigned to the Orthodox Patriarchate, its deteriorated condition led to its abandonment. In 1461, the church was demolished, and the Fatih Mosque was built directly on its foundations.

Today, nothing of the original structure survives.

Yet the location itself remains deeply significant. Standing on one of the highest hills of the Historic Peninsula, the site continues to dominate the surrounding landscape — just as it did in Byzantine times.

2. Hagia Eirene

Hagia Eirene is one of the oldest surviving churches in Constantinople and holds a unique place among the city’s Byzantine monuments. Long before Hagia Sophia was built, it served as the main church of the city and hosted important events such as the Second Ecumenical Council in 381.

The building we see today largely dates back to the 8th century. Like many structures in the city, it was damaged during the Nika Revolt and later rebuilt by Emperor Justinian. However, the most defining reconstruction came after an earthquake in 740, during the period of Byzantine Iconoclasm — a time when religious images were officially banned.

This historical moment shaped the character of Hagia Eirene in a very visible way.

Unlike other churches in Istanbul, its interior contains no figural mosaics. Instead, a single large cross dominates the apse — a rare and powerful example of iconoclastic art that has survived almost untouched.

Another feature that sets Hagia Eirene apart is its continuity.

After the Ottoman conquest in 1453, the church was not converted into a mosque. Because it stood within the outer courtyard of Topkapı Palace, it was repurposed as an imperial arsenal rather than a place of worship. This unusual history allowed the building to preserve its original architectural form with very little alteration.

Today, Hagia Eirene stands quietly in the first courtyard of Topkapı Palace. Compared to the crowds of nearby Hagia Sophia, it offers a much more subdued and contemplative atmosphere. Its vast, empty interior and remarkable acoustics have also made it a preferred venue for classical music concerts in recent years.

3. Stoudios Monastery

Stoudios Monastery is the oldest surviving church structure in Istanbul, dating back to the 5th century. Built in 462 near the Golden Gate — the ceremonial entrance of Constantinople — it represents one of the earliest examples of a basilica-type church in the city.

Dedicated to John the Baptist, the monastery soon became far more than a religious complex. It evolved into the most influential monastic center in Constantinople. The monks of Stoudios played a decisive role in shaping Orthodox religious life, and their authority often extended beyond theology into imperial politics.

During the Iconoclast period, the monastery became one of the strongest centers of opposition to the ban on religious images. Its leaders defended the use of icons at a time when this position carried significant risk, reinforcing the monastery’s reputation as a place of intellectual and spiritual resistance.

Stoudios was also known for a remarkable tradition.

The monks belonging to the Akoimetoi (the “Sleepless Ones”) maintained continuous prayer by rotating in shifts, ensuring that worship never stopped — day or night. This practice gave the monastery a unique rhythm that distinguished it from other religious institutions in the city.

Following the Ottoman conquest, the complex was converted into a mosque in 1486 and became known as Imrahor Mosque. Over time, earthquakes and fires caused severe damage. The roof collapsed in the early 20th century, leaving the structure largely abandoned.

Today, only parts of its walls and architectural elements remain standing. Although the site has long been closed to visitors, its historical significance continues to attract attention. As of 2026, the Istanbul Governor’s Office announced plans for a comprehensive restoration, with the long-term goal of reopening the monument to the public.

Even in its current state, Stoudios Monastery remains one of the most historically significant — and often overlooked — Byzantine sites in Istanbul.

4. Church of St. Polyeuktos

The Church of St. Polyeuktos was once one of the most ambitious churches ever built in Constantinople, although today only fragments of its structure remain.

The ruins, discovered during excavations in the 1960s near the Valens Aqueduct, belong to a church commissioned in the early 6th century by Anicia Juliana — a member of one of the most prestigious Roman aristocratic families.

This was not an ordinary act of patronage.

Juliana’s background placed her within the imperial lineage, and the construction of this church is often interpreted as a statement of status at a time of political transition. When the throne passed to Justin I and later to Justinian — figures of more modest origin — Juliana responded not through politics, but through architecture.

The result was a church that, for a brief moment, stood among the most monumental structures in the city.

Historical sources suggest that the building was richly decorated with carved marble, intricate reliefs, and architectural elements inspired by earlier imperial traditions. Some scholars believe that its scale and ornamentation influenced later Byzantine architecture, including the great constructions of Justinian’s reign.

The church did not survive intact.

During the Fourth Crusade in 1204, it was heavily damaged and stripped of many of its decorative elements. Several of its sculptural fragments are believed to have been transported to Western Europe, contributing to the dispersal of Byzantine art beyond the city.

Today, the site in Saraçhane has taken on a new life.

Recent excavation and restoration efforts have transformed the area into an open-air archaeological space, making the remains more accessible and easier to understand within their urban context. Although only partial ruins are visible, they offer a glimpse into a period when architectural patronage was closely tied to imperial ambition.

5. Church of Sergius and Bacchus

Little Hagia Sophia Mosque, originally known as the Church of Saints Sergius and Bacchus, is one of the earliest imperial churches built during the reign of Emperor Justinian in the 6th century.

Constructed shortly after Justinian came to power, the church reflects a moment of transition in Byzantine architecture. While earlier monumental churches followed the traditional basilica plan, this building introduced a more experimental design — a centralized space formed by an octagonal core beneath a dome.

This architectural approach marked an important shift. Some historians interpret this shift as part of a broader architectural response to earlier ambitious projects in the city, such as the Church of St. Polyeuktos, where elite patronage had already pushed the boundaries of scale and decoration.

Rather than repeating established forms, Justinian’s architects explored new spatial concepts that would later culminate in the construction of Hagia Sophia. In this sense, the Church of Sergius and Bacchus can be understood as part of the developmental phase that preceded one of the most iconic buildings of the Byzantine world.

The interior preserves several original features from this early period. Marble columns, finely carved capitals, and inscriptions in Greek still reflect the artistic language of the Justinianic era. These elements offer a more intimate perspective on Byzantine design, allowing visitors to observe details that are often difficult to appreciate in larger monuments.

After the Ottoman conquest, the church was converted into a mosque and became known as the Little Hagia Sophia. This transformation ensured the survival of the structure while integrating it into the religious life of the city.

Today, the building stands slightly removed from the main tourist flow of Sultanahmet. Its quieter setting and manageable scale make it one of the most accessible places to understand early Byzantine architecture within its original urban context.

6. Hagia Sophia

Hagia Sophia stands as the most influential monument of Byzantine Constantinople and one of the defining buildings in the history of architecture.

The structure seen today is the third church built on this site. The first two, constructed during the 4th and 5th centuries, were both destroyed during periods of political unrest, most notably the Nika Revolt of 532. In the aftermath of this uprising, Emperor Justinian commissioned an entirely new building — one that would surpass anything previously constructed in the ancient world.

Completed in 537 by Anthemius of Tralles and Isidore of Miletus, Hagia Sophia introduced a revolutionary architectural concept. Its massive dome, seemingly suspended above a vast interior, redefined the relationship between space, light, and structure. For nearly nine centuries, it remained the largest church in the world and served as the ceremonial and spiritual center of the Byzantine Empire.

This was more than a place of worship.

It was the architectural expression of imperial power.

Following the Ottoman conquest in 1453, the building was converted into a mosque, a transformation that ensured its preservation while adding new layers to its identity. In the 20th century, it functioned as a museum, before being reconverted into a mosque in 2020.

Today, the visitor experience has changed significantly.

Access for foreign visitors is now organized through the upper galleries, while the ground level is reserved for worship. This arrangement allows visitors to observe the structure from an elevated perspective, where many of the surviving Byzantine mosaics — including imperial portraits and religious compositions — are still visible.

Despite these changes, Hagia Sophia remains a place where multiple historical layers coexist. Its architecture, decoration, and ongoing function continue to reflect the complex continuity of the city itself.

7. Constantine Lips Monastery

Fenari Isa Mosque, originally known as the Constantine Lips Monastery, represents a different phase in Byzantine architecture — one that moves away from monumental imperial churches toward more intimate and structured religious spaces.

The original church was built in 907 by Constantine Lips, a high-ranking admiral during the reign of Emperor Leo VI. Unlike earlier basilicas, this building followed a cross-in-square plan, a layout that became characteristic of Middle Byzantine architecture. Its relatively compact form, multiple domes, and enclosed spatial organization reflect a shift in both architectural taste and religious practice.

This was no longer architecture designed for large imperial gatherings.

It was a space shaped for smaller, more controlled communities.

Inside, the atmosphere differed significantly from earlier churches such as Hagia Sophia. Instead of expansive, light-filled interiors, the structure emphasized a more enclosed and subdued environment. The use of brick piers rather than large marble columns created broader wall surfaces, which were once intended for decorative programs such as frescoes or mosaics.

The complex evolved further in the 13th century.

During the Palaiologan period, a second church was added to the south by Empress Theodora, turning the site into a dynastic burial place. This addition created a layered structure where two different phases of Byzantine architecture coexist within a single complex.

After the Ottoman conquest, the building was converted into a mosque and became known as the Fenari Isa Mosque. Today, it remains an active place of worship, preserving both its architectural integrity and its historical significance.

8. Monastery of Myrelaion

Bodrum Mosque, originally known as the Monastery of Myrelaion, was built in the early 10th century by Emperor Romanos I Lekapenos as part of a private palace complex and family burial site.

Unlike the monumental churches of earlier centuries, Myrelaion reflects a more personal form of imperial patronage. Romanos, who rose from a military background to become emperor, commissioned this complex as a statement of legitimacy — establishing a new dynastic center within the city.

His rise to power was closely tied to the imperial court. The position of the Lekapenos family was firmly secured when his daughter Helena married Emperor Constantine VII, linking the dynasty directly to the ruling Macedonian line. This background explains why the complex was conceived not only as a residence, but also as a carefully planned dynastic burial site.

The architecture follows the cross-in-square plan that became typical of the Middle Byzantine period. Compared to earlier structures, the building is more compact, yet carefully proportioned. A single dome rises above the central space, creating a balanced and clearly defined interior, while the use of brick construction gives the structure a distinct visual character.

One of the most unusual aspects of the site lies beneath the church.

The building was constructed on top of a large circular structure dating back to Late Antiquity. This earlier rotunda was transformed into a cistern by filling its interior with approximately eighty columns, creating a massive substructure that supported the church above. This layered design gives Myrelaion a unique architectural identity within the city.

For a period, members of the Lekapenos family were buried here, reinforcing the site’s role as a dynastic monument. However, like many political stories in Byzantium, the rise of the family was followed by a rapid decline.

After the Ottoman conquest, the church was converted into a mosque and became known as the Bodrum Mosque — a name that refers to the large substructure beneath it. Today, it remains an active place of worship, standing quietly within one of the busiest commercial districts of the Historic Peninsula.

9. Monastery of Christ Pantepoptes

Eski Imaret Mosque, originally known as the Monastery of Christ Pantepoptes, represents the architectural and political transformation of Byzantium during the Komnenian period.

Built in the late 11th century by Anna Dalassene — the mother of Emperor Alexios I Komnenos — the monastery reflects a time when power in the empire was increasingly shaped by influential families rather than traditional aristocratic elites of Constantinople.

The name Pantepoptes, meaning “the All-Seeing,” is closely tied to the building’s location.

Situated on one of the hills overlooking the Golden Horn, the monastery commands a wide view of the surrounding landscape. This elevated position not only defined its symbolic meaning but also gave it a strategic advantage during times of conflict.

Architecturally, the church follows the Middle Byzantine tradition seen in structures such as Lips and Myrelaion. Its scale is modest, and its design emphasizes proportion and structural clarity rather than monumental display. The refined brickwork on the exterior remains one of the most distinctive features of the building.

The monastery is also associated with a dramatic moment in the city’s history.

During the Fourth Crusade in 1204, Emperor Alexios V Doukas is believed to have used this location as a command point to observe the movements of the Crusader fleet in the Golden Horn. From here, the final stages of the city’s defense unfolded.

After the Ottoman conquest, the building was converted into a mosque and became known as the Eski Imaret Mosque — a name that refers to its temporary use as a public kitchen in the early Ottoman period.

Today, the structure stands within the historic Zeyrek district, offering not only architectural insight but also a sense of the city’s layered urban fabric.

10. Church of Hagia Theodosia

Gül Mosque, originally dedicated to Saint Theodosia, is one of the most atmospheric surviving Byzantine churches in Istanbul, located near the Golden Horn in the Ayakapı district.

Although its exact construction date is uncertain, the building is generally attributed to the late 11th century, during a period when Byzantine architecture had reached a more refined and balanced form. Its tall drum and domed structure continue to define the surrounding neighborhood, preserving the silhouette of a medieval church within the modern city.

The church was dedicated to Saint Theodosia, a figure closely associated with the Iconoclast period.

According to Byzantine tradition, she was martyred in the 8th century for resisting the removal of sacred images, becoming a symbol of devotion during one of the most turbulent theological conflicts in the empire. Over time, the church dedicated to her became an important place of veneration.

The building’s later name — Gül Mosque — is linked to a well-known tradition.

It is said that when Ottoman soldiers entered the city in 1453, the church was decorated with roses for the feast day of Saint Theodosia. This detail, whether historical or symbolic, has remained part of the building’s identity and continues to shape how it is remembered today.

Architecturally, the structure reflects the Middle Byzantine style, with its cross-in-square plan and solid brick construction. Unlike some of the more monumental churches, its character lies in its proportions and presence within the urban fabric rather than in scale.

After the Ottoman conquest, the building was converted into a mosque and has remained in continuous use ever since. Today, it stands slightly off the main tourist routes, offering a quieter and more reflective encounter with the Byzantine past.

11. Monastery of Christ Pantokrator

Zeyrek Mosque, originally the Monastery of Christ Pantokrator, was one of the largest and most important religious complexes of late Byzantine Constantinople.

Built in the early 12th century during the reign of Emperor John II Komnenos and Empress Irene, the complex reflects a shift in imperial patronage. Rather than concentrating power around the traditional ceremonial center near Hagia Sophia, the Komnenian dynasty established new monumental foundations across the city.

Pantokrator was one of the most significant of these.

The complex consisted of three interconnected churches: one dedicated to Christ Pantokrator, another to the Virgin Mary, and a central chapel that served as the dynastic burial space. This multi-part structure gives the building its distinctive scale and asymmetrical appearance.

More than a monastery, it functioned as a major institutional center.

Historical sources describe associated facilities including a hospital, charitable services, and accommodation for clergy, making it one of the most advanced religious foundations of its time. Through these functions, the complex became both a spiritual and social hub within the city.

Architecturally, the structure represents the mature phase of Middle Byzantine design. Its layered domes, balanced proportions, and refined brickwork reflect a period when Byzantine architecture had moved beyond earlier experimentation into a more controlled and cohesive style.

The complex also became the burial place of members of the Komnenos dynasty and later Byzantine rulers, reinforcing its role as a center of imperial memory during the final centuries of the empire.

Following the Ottoman conquest, the building was converted into a mosque and became known as the Zeyrek Mosque. Today, it remains one of the most prominent surviving Byzantine monuments in Istanbul, standing on a hill overlooking the Golden Horn.

12. Theotokos Kyriotissa

Kalenderhane Mosque is one of the most complex and layered Byzantine structures in Istanbul, reflecting nearly a millennium of architectural transformation.

Rather than being the product of a single period, the building incorporates elements from multiple phases of the city’s history. Archaeological findings indicate that the site was originally occupied by a Roman structure, followed by successive churches built and modified between the 7th and 12th centuries.

The present form of the building largely dates to the late 12th century, during the Komnenian period, when earlier components were integrated into a unified structure. As a result, different architectural elements — including the apse, side spaces, and later additions — reflect distinct moments in Byzantine construction.

This layered composition gives the building a unique character.

It is not a single architectural statement, but a sequence of adaptations over time.

One of the most remarkable chapters in its history occurred during the Latin occupation of Constantinople (1204–1261). During this period, the church was used by Franciscan monks, and parts of the structure were decorated with frescoes depicting scenes from the life of Saint Francis of Assisi — a rare example of Western religious imagery within a Byzantine setting.

Following the Ottoman conquest, the building was converted into a mosque and became known as the Kalenderhane Mosque. The name reflects its later association with dervish communities, adding yet another layer to its historical identity.

Today, the structure stands near the Valens Aqueduct, preserving traces of different civilizations within a single architectural framework.

13. Church of Panagia Mouchliotissa

The Church of St Mary of the Mongols, also known as Panagia Mouchliotissa, is one of the most unique surviving Byzantine churches in Istanbul.

Built in the late 13th century during the final phase of the Byzantine Empire, the church is associated with Maria Palaiologina, a member of the imperial family whose life reflects the broader diplomatic networks of Constantinople. After being married into the Mongol ruling elite as part of a political alliance, she later returned to the city and established this monastic foundation, where she spent her final years.

Architecturally, the building represents the refined style of the Palaiologan period. Its compact form, domed interior, and carefully articulated brick construction reflect a phase in which Byzantine architecture emphasized balance and proportion over monumentality.

What distinguishes this church, however, is not its scale or decoration.

It is its continuity.

Unlike most Byzantine churches within the city, this building was never converted into a mosque after the Ottoman conquest. According to tradition, an imperial decree granted protection to the church, allowing it to remain in continuous use by the Orthodox community.

This uninterrupted function makes it the only surviving Byzantine church in Istanbul that has preserved its original religious role from the Byzantine period to the present day.

Located on the slopes of the Fener district, the church stands slightly apart from the main urban flow, preserving a quieter and more enclosed atmosphere within its surrounding walls.

14. Pammakaristos Church

Fethiye Mosque, originally known as the Church of the Theotokos Pammakaristos, was one of the most important religious institutions of late Byzantine Constantinople.

Built between the 11th and 12th centuries and later expanded during the Palaiologan period, the complex reflects the final phase of Byzantine architectural and artistic development. Its elevated position overlooking the Golden Horn placed it within one of the prominent religious districts of the later capital.

The church gained particular importance after the Ottoman conquest.

For more than a century, it served as the seat of the Ecumenical Patriarchate, making it the spiritual center of the Orthodox world during a critical transitional period. This role added a new layer of significance to a building that was already associated with imperial patronage.

Architecturally, the structure combines elements of both Middle and Late Byzantine design. The main church and the southern funerary chapel — known as the parekklesion — form a unified composition, reflecting the more refined and expressive style of the Palaiologan Renaissance.

This chapel once contained some of the finest Byzantine mosaics in Istanbul, representing the artistic revival of the empire’s final centuries.

However, the current visitor experience is limited.

While the main structure functions today as an active mosque, the parekklesion — which houses these mosaics — has been closed for restoration in recent years. As of early 2026, access to this section is still not available.

Even so, the building remains an important reference point for understanding the religious and artistic landscape of late Byzantine Constantinople.

15. Chora Church

Kariye Mosque, known in Byzantine times as the Church of the Holy Saviour in Chora, preserves one of the most remarkable artistic ensembles of the Byzantine world.

Originally founded outside the early city walls of Constantinople, the monastery later became enclosed within the expanded fortifications built under Theodosius II. Its name, Chora, meaning “in the countryside” or “outside the city,” reflects this earlier setting — a reminder of the landscape that once surrounded the site.

The church reached its artistic peak in the early 14th century.

Under the patronage of Theodore Metochites, a scholar and high-ranking statesman, the building was transformed into a masterpiece of the Palaiologan Renaissance. The interior was decorated with mosaics and frescoes of exceptional narrative complexity, depicting scenes from the lives of Christ and the Virgin Mary with a level of detail and expression rarely matched in Byzantine art.

Unlike the monumental scale of Hagia Sophia, Chora offers a more intimate experience.

Its mosaics unfold as a visual narrative across the inner and outer narthexes, guiding visitors through a carefully constructed theological story. In the funerary chapel, or parekklesion, the frescoes explore themes of death and salvation, culminating in the well-known Anastasis scene — one of the most dynamic representations of resurrection in medieval art.

Following the Ottoman conquest, the building was converted into a mosque and later functioned as a museum for much of the 20th century. After a long period of restoration between 2020 and 2024, it has reopened and now operates again as a mosque.

Today, visitors can still observe its mosaics and frescoes, making it one of the most important sites in Istanbul for understanding the artistic and spiritual world of late Byzantium.

Conclusion

The Byzantine churches of Istanbul are not defined by a single style or period.

They range from monumental imperial foundations to smaller, more intimate structures, reflecting the changing priorities of the city across centuries. Some represent the height of Byzantine power, while others reveal its final artistic and spiritual expressions.

Together, they form a continuous record of transformation.

From early Christian basilicas to domed masterpieces, from imperial mausoleums to neighborhood mosques, these buildings illustrate how Constantinople evolved into Istanbul without losing the physical traces of its past.

Exploring them is not simply about visiting historical sites.

It is about understanding how architecture, religion, and daily life intersected in one of the most complex cities in history.

Byzantine History Tour in Istanbul

My name is Serhat Engul, and I have been working as a licensed tour guide in Istanbul since 2004. One of the most rewarding aspects of my work is guiding visitors through the Byzantine layers of the city.

If this topic interests you, a guided walk can help you connect these monuments into a meaningful historical narrative — rather than experiencing them as isolated sites.

The post 15 Byzantine Churches in Istanbul (2026 Update) appeared first on Istanbul Clues.

The Pantocrator Monastery was built in the late Byzantine period, and its church was the third most important religious building in Constantinople during the Middle Ages. The Pantokrator Church was also the burial place of late Byzantine emperors.

Many members of the imperial family, especially members of the Komnenos dynasty, were buried here. The building, which was converted into a mosque during the Ottoman period, has recently undergone a large-scale restoration.

In order to place the Pantokrator Monastery in Byzantine history, it is necessary to mention a little about the Roman history of Istanbul. So you can see the differences between early Byzantine architecture and the late period.

Monumental Buildings of Roman Istanbul

Byzantium, the ancient Greek city, became the new capital of the Roman Empire in 330. The city, which was rebuilt between 324 and 330 on the orders of Emperor Constantine, was equipped with Roman buildings.

The Great Palace of the Emperors, the Hippodrome where the races were held, the Forum of Constantine, the city square, and the Church of the Holy Apostles, a monumental religious building, were the monumental buildings of Roman Istanbul.

The city’s borders were determined by Emperor Constantine himself. It started from the Sultanahmet area where Hagia Sophia and Topkapi Palace are located and ended at the Ataturk Boulevard of today.

In the next few decades, Constantinople became the largest city in the world. City walls had to be expanded due to the increase in population. During the reign of Emperor Theodosius II, strong walls, which we know today as Walls of Constantinople, were built.

Hellenization of the Roman Cult

Constantinople was founded as a city bearing the legacy of Ancient Rome. Many traditions in Rome, the ancient capital of the Roman Empire, were moved here by Constantine. However, the Roman Palace, which was under the influence of Eastern culture, became Hellenized for 300 years between Emperor Constantine and Emperor Heraclius.

By the end of the 600s, Latin culture almost disappeared in Constantinople. The powerful cultural heritage of Ancient Greece had transformed the Latin cult. The resulting hybrid culture was neither exactly Western nor Eastern.

For this reason, modern time historians named Eastern Roman Empire, the continuation of the Roman Empire, by the name of Byzantine, inspired by the city’s ancient name. Hellenization of the Roman Cult was allegedly completed during the reign of Emperor Heraclius.

Constantinople in the Middle Ages

Byzantine Empire, which had survived many troubles throughout history, managed to survive for a millennium. However, it had a feudal order and was shared among the dynasties. Families who wanted to seize political power were in great competition with each other. This order also manifested itself in the capital Constantinople. Strong families established palaces and monasteries in various neighborhoods with their supporters.

The Great Palace, which was the legendary structure of Constantinople, had begun to lose its importance on this occasion. Emperors started to live in Palace of Blachernae from the 11th century onwards. Located in today’s Ayvansaray district, this palace was adjacent to the Walls of Constantinople. It was at the place where the walls of Constantinople, starting from the Sea of ​​Marmara, meet the Golden Horn.

Just as the old Great Palace was abandoned, the Church of the Holy Apostles, the mausoleum of the emperors, also lost its importance. This church, where the most important emperors of the past such as Constantine, Justinian and Heraclius were buried, was no longer as popular as before.

Monastery of Christ Pantocrator

Due to this trend, the Komnenos designed a church with an underground cemetery where the dynasty members would be buried. In this place called Monastery of Christ Pantokrator, dozens of religious officials would serve. There would be 80 monks, 45 ministers and a hospital within the foundation.

Church of the Monastery of Christ Pantocrator consists of three separate buildings adjacent to each other. The structures were built at different times and are not symmetrical. However, the Church of the Monastery, which was a combination of three churches, is still impressive.

1. The First Church on the Southern Side

The first church, the construction of which began in 1118, was dedicated to Jesus Christ. This church, which was started by Eirene, the wife of Emperor Alexios I Komnenos, was completed by his son John II after the death of the empress. There was a dome of 7 meters in diameter on the square planned building.

In the inscriptions of travelers in the Ottoman period, four red columns surrounding the dome were mentioned. However, since the columns of the building damaged after the earthquake in 1766 were renewed, the old columns were replaced by new columns in the baroque order.

Another striking feature of the church on the south side was its magnificent stained glass. At a time when the art of stained glass in Europe was still in its infancy, scrumptious stained-glass windows adorned this church in Istanbul. The fact that blue was a rather difficult color to obtain in Europe at that time caused the Europeans to call the color in the Byzantine stained glass “Greek Blue”.

PHOTO: Above you can see a photo of Zeyrek Mosque taken from the East. Thus, the first church built in the south remains on the left hand side. The dimensions of this first church dedicated to Jesus are relatively larger.

2. The Second Church on the Northern Side

The first church we mentioned in the upper lines was dedicated to the Christ Pantocrator (The Almighty). The second church, built by John II Komnenos, was dedicated to the Virgin Mary.

John II, who put a second church next to the first church built by his mother, faced some difficulties. The new church in the North direction could not be built in the same dimensions as the old church in the South. For this reason, the square planned building in the first church could not be preserved and became rectangular.

From the very beginning of the project, the church was designed to be the tomb chapel of the Komnenos Dynasty. For this purpose, a chapel was built between the Southern Church dedicated to Jesus and the Northern Church dedicated to the Virgin Mary. Thus, two churches with different dimensions were combined with a chapel built in the middle.

The emperor wanted to place a dome as large as possible on the chapel and increase the splendor of the building. However, the dome would rest on the side walls of the two previously built churches and its space was limited. Ultimately, the chapel was covered with an ellipse-shaped dome with a long diameter of 8 meters and a short diameter of 7 meters.

With the gathering of three churches, an imposing structure emerged. The Church of the Monastery of Christ Pantokrator was the third largest church of Constantinople after the Hagia Sophia and the Church of Holy Apostles.

PHOTO: Above you can see a photo of Zeyrek Mosque taken from the West. The church on the left hand side in this photo is dedicated to the Virgin Mary. In addition, the dome of the burial chapel is visible in the middle.

3. The Burial Chapel of Late Byzantine Emperors

The Church of Christ Pantocrator continued to be the burial chapel of the imperial family until the last years of the Byzantine Empire. Many were buried here, first from the Dynasty of Komnenos and later from the Dynasty of Paleologos. The last person buried in the Pantokrator Monastery Church was Helena Dragazes, the mother of the last Byzantine emperor Constantine XI Paleologos.

Zeyrek Mosque in the Ottoman Era

Church of Christ Pantocrator was turned into a mosque after the conquest of Istanbul. The mosque was dedicated to Molla Zeyrek, one of the leading religious scholars of the Sultan Mehmed II period. Zeyrek Mosque was closed in 2009 for renovation and opened to visitors again in 2019.

If you want to take pictures of the Church the Monastery of Christ Pantocrator, I suggest you go to the steel-made subway bridge in Golden Horn. The most beautiful place where the church can be watched with all its majesty is this bridge.

Conclusion

Hello, my name is Serhat Engul. I have been working as a private tour guide in Istanbul for many years. The history of the Byzantine Empire is the most mysterious period in the history of Istanbul. For this reason, I worked hard to specialize in this subject, which piqued my curiosity.

If you are interested in Byzantine history, you can find many relevant articles in the Old City and History categories of this site. Also, those who will visit Istanbul may consider joining a private Byzantine history tour with me.

Monastery of Christ Pantocrator Facts by Serhat Engul

The post Monastery of Christ Pantocrator (Zeyrek Mosque) 2024 appeared first on Istanbul Clues.

After being damaged during the Nika Revolt of 532, Hagia Irene was reconstructed under Emperor Justinian. The building was reshaped once again following the major earthquake of 740, leaving it with the distinctive architectural character visitors can still experience today.

Located within the First Courtyard of Topkapi Palace, Hagia Irene now functions as a museum and occasional concert venue. This guide explores its long history, restrained interior, and unusual place among Istanbul’s Byzantine monuments, followed by the latest entrance fee and visiting information.

History of the Hagia Irene Church

The history of Hagia Irene reaches back to the earliest centuries of Christianity in Istanbul. To understand how the church developed, it is helpful to begin with Byzantium, the ancient city that existed here long before Constantinople became the capital of the Roman Empire.

1. The Pagan Temple

Byzantium was founded around 660 BC by Greek settlers who established their acropolis on Seraglio Point, the hill now occupied by Topkapi Palace. The city was named after Byzas, the legendary leader associated with its foundation.

For centuries, Byzantium remained a relatively small settlement. After coming under Roman control, it was rebuilt and expanded by Emperor Septimius Severus in the late 2nd century. Among the major additions was a hippodrome, an early predecessor of the larger arena later developed by Constantine the Great.

According to tradition, a pagan sanctuary dedicated to Aphrodite once stood near the site of Hagia Irene. As Christianity spread through the Roman Empire, the area was gradually transformed into a Christian place of worship, forming the earliest layer in the long history of the church.

2. Constantine’s Hagia Irene Church

In the early 4th century, Emperor Constantine decided to establish a new imperial capital in the East. He began rebuilding the small city of Byzantium in 324, and the expanded capital was formally inaugurated as Constantinople in 330.

The Great Palace and the enlarged Hippodrome became the ceremonial center of the new city. Constantine also commissioned major monuments such as the Forum of Constantine and the Church of the Holy Apostles.

During this transformation, the earlier Christian building on the site of Hagia Irene was enlarged and rebuilt. The church became known as Hagia Irene, or Hagia Eirene, meaning “Holy Peace.”

The first Hagia Sophia was completed nearby during the reign of Constantine’s son, Constantius II. Hagia Sophia and Hagia Irene stood beside one another, separated by a courtyard, and together formed part of the episcopal complex known as the Megale Ekklesia, or “Great Church.”

3. Justinian’s Hagia Irene Church

In 532, during the fifth year of Emperor Justinian’s reign, tensions in Constantinople erupted into the Nika Revolt. The Blues and Greens, rival factions associated with the chariot races in the Hippodrome, had grown into powerful social and political groups with large followings across the city.

The uprising began on January 13 while Justinian was watching the races from the imperial lodge. It quickly spread beyond the Hippodrome, leading to widespread violence, looting, and fires. Both Hagia Sophia and Hagia Irene were badly damaged and burned during the revolt.

The rebellion was eventually suppressed by imperial forces under generals Belisarius and Mundus. Traditional accounts claim that tens of thousands of people were killed. In the aftermath, Justinian launched an ambitious rebuilding program intended to restore both the city and imperial authority.

The present Hagia Sophia was the most important monument created during this campaign, while Hagia Irene was also reconstructed on a more restrained scale. Its design featured a central dome supported by four arches, with vaulted sections extending along the nave. The resulting structure shared certain architectural features with other major churches of 6th-century Constantinople, including the now-lost Church of Saint Polyeuctus.

4. The Byzantine Iconoclasm

Hagia Irene was severely damaged by an earthquake in 740 and was rebuilt during the period of Byzantine Iconoclasm. This movement, which began under Emperor Leo III and continued in different phases for more than a century, opposed the use of religious images in Christian worship.

During this period, many mosaics, frescoes, and icons across the Byzantine Empire were removed or destroyed. Churches rebuilt under iconoclast rule generally adopted a more restrained decorative language based on crosses, geometric patterns, and non-figurative motifs.

This simplicity still defines the interior of the church today. Its most striking surviving decoration is the large cross in the apse, a rare and important reminder of the iconoclast period in Byzantine art.

5. The Church during the Ottoman Period

After the Ottoman conquest of Constantinople in 1453, Sultan Mehmed II began constructing a new imperial residence on Seraglio Point. This complex later developed into Topkapi Palace, and Hagia Irene became enclosed within its outer walls. As a result, the church was separated from Hagia Sophia and its former ecclesiastical setting.

Unlike Hagia Sophia, Hagia Irene was never converted into a mosque. It also ceased to function as a church and was used for centuries as an imperial armory and storehouse. During the 19th century, the building acquired a new cultural role, first serving as a military museum and later housing archaeological collections.

Under the direction of the painter, archaeologist, and museum administrator Osman Hamdi Bey, historical objects collected from across the Ottoman Empire were exhibited here. These collections were later transferred to the newly established Istanbul Archaeological Museums, located between Topkapi Palace and Gülhane Park.

6. The Hagia Irene Museum in Istanbul

Shaped by repeated fires, earthquakes, and centuries of changing use, Hagia Irene has a more austere appearance than many of Istanbul’s better-known Byzantine monuments. Its bare walls and restrained decoration may seem modest beside Hagia Sophia, yet they preserve an atmosphere rarely found elsewhere in the city.

While many former Byzantine churches were transformed through later Ottoman additions, Hagia Irene offers a quieter and more immediate sense of a medieval sacred space. Its vast interior, faded surfaces, and remarkable acoustics invite visitors to slow down and imagine the many layers of history that have passed through the building.

Hagia Irene Museum Entrance Fee 2026

The entrance fee for Hagia Irene is 1,050 Turkish liras as of 2026. The Museum Pass Istanbul is valid for admission to Hagia Irene.

Visitors may also purchase the 2,750 TL combined ticket, which includes Topkapi Palace, the Harem Rooms, and Hagia Irene.

Ticket prices were last updated in July 2026. Since admission fees may change during the year, checking the current price before your visit is recommended.

Hagia Irene Museum Opening Hours 2026

Hagia Irene is open between 09:00 and 17:30 and is closed to visitors on Tuesdays.

Since the former Byzantine church is located within the First Courtyard of Topkapi Palace, it follows the palace’s visiting schedule. Opening hours may occasionally change because of official events, restoration work, or seasonal arrangements, so it is advisable to check the latest visitor information before your visit.

Conclusion

Hagia Irene holds a distinctive place among Istanbul’s surviving Byzantine monuments. From the moment you enter, its restrained interior, bare surfaces, and vast medieval space create an atmosphere that feels very different from the city’s more familiar historic landmarks.

Many Byzantine buildings in Istanbul were later transformed through Ottoman additions or new religious uses. Hagia Irene, however, was never converted into a mosque, allowing it to preserve a quieter and more immediate connection with its Byzantine past.

To explore more traces of Byzantine Constantinople, you can also take a look at my private Byzantine history tours in Istanbul, which include several monuments connected with the city’s imperial heritage.

The post Hagia Irene Entrance Fee & Hours (2026 Update) appeared first on Istanbul Clues.

It may be surprising to come across such a detailed article on Tetrarchy in an Istanbul blog. However, the road to the establishment of Constantinople and its declaration as the capital of Roman Empire began with the Tetrarchy.

In this article you can find maps depicting the Tetrarchy period. In addition, the Tetrarchy emperors and the ciwil wars that took place in this period are noted in detail. In order to explain this period, I would like to make a brief introduction to Roman history.

Crisis of the Third Century

After Julius Caesar’s adopted son Octavius was enthroned as “Augustus”, the Roman Empire witnessed a long rising period. The prosperity of the empire peaked during Nerva-Antonine Dynasty (96-192) and it continued during the Severan Dynasty (193-235) despite ups and downs.

When Severus Alexander was executed by his own soldiers in 235, a period of turmoil called the Crisis of the Third Century began in the history of the Roman Empire. During this 50 years of long crisis period, emperors were assassinated one after another and they couldn’t rule the empire more than a couple of years.

The emperor who ended this chaotic era was Emperor Diocletian. Diocletian served as an officer in the cavalry army of Emperor Carus and rose rapidly due to his military success.

After Carus’ unexpected death, his son Carinus and Numerius seized the power. However, the prominent figures of the Roman Empire and Diocletian, the most popular general of the army, didn’t want Carus’ sons. Therefore, they settled accounts at the Battle of the Margus nearby Serbia. Carinus died in the battle and his brother Numerius was probably assassinated.

In the end, Diocletian claimed the throne as the Roman Emperor in 284. Diocletian’s 20 years reign began in the empire that would end by his voluntary abdication. Diocletian was a very unusual man and he was the first emperor in the Roman Empire that would abdicate the throne willingly. He spent his retirement years by doing farming at Split in Croatia.

The Roman Tetrarchy (Rule of Four)

Diocletian probably had tendencies to share the power even before he claimed the throne. Because he knew that one of the biggest problems in the Roman Empire was the succession system. Even after the most prosperous times, civil wars were inevitable when the emperors did not leave a decent heir.

Another problem was that Rome was too big to be ruled by a single person. Thus, Diocletian decided on the The Roman Tetrarchy (Rule of Four) system, which divided the empire between two senior rulers and included the junior emperors who would follow them.

The two senior emperors who ruled the empire during the Tetrarchy would be called “Augustus” and the two junior emperors under them would be called “Caesar”. This system caused great wars that would change Roman history. You can find all the details about this period in the following 15 titles.

1. Maximian Becomes “Augustus”

One of the reasons Diocletian wanted to introduce the Tetrarchy was to ensure continuity in administration. Because during the crisis of the 3rd century, the life of the emperors was very short due to coups. There was a perception among the people and the soldiers that the emperor who ascended the throne could not stay in power for more than a few years.

As Diocletian was aware of this perception, he was worried that the reforms he was going to initiate would be left unfinished. Therefore, his first action was to divide the rule into two. While he ruled the Eastern provinces, Maximian would become the second “Augustus” and rule the West.

During these years, the Roman Empire had big problems both in the East and the West. According to Diocletian, an emperor engaged in reforms could not simultaneously lead wars. In order to make quick and firm decisions, two rulers with absolute authority in both sides were necessary.

There was a fight with Persian Empire over Syria and Armenia in the East. On the other hand, there was a usurper emperor named Carausius in the Britain. He claimed himself as the “Emperor of the North”. The first thing Diocletian expected from his colleague Maximian was to take Britain back.

Although Carausius was seen as a usurper by the Romans, he took control of the legions in Britain and he was accepted by the public. Also, he managed the trade in Britain successfully. As he brought wealth and prosperity, he was supported both in England and nearby countries.

Under these circumstances, Maximian’s march to Britain failed. A storm destroyed the ships of the Roman Empire’s navy and the campaign (290) launched with limited force turned out to be a flop.

2. The Roman Tetrarchy Map

Diocletian knew the empire was in danger of being torn apart. As was the case in Britain and Egypt later, the commanders in the army started to declare themselves as Tyrants and steal lands from the Roman Empire.

Diocletian saw that the co-imperial system did not solve the problems either, and promoted two generals, Constantius Chlorus in the West and Galerius in the East, as Caesars. Now let’s take a look at the power sharing of the Tetrarchy (Rule of Four).

On The Roman Tetrarchy Map above you can see exactly how the emperors shared the lands. Maximian rules the West as “Augustus” and Diocletian rules the East as “Augustus” as senior emperors.

Constantius as “Caesar” rules in the West and Galerius as “Caesar” in the East as junior emperors. The Caesars’ task is to quickly move into troubled areas and lead wars. It is Diocletian who has absolute authority among all rulers and makes the final decisions regarding appointments.

What was expected of the newly appointed caesars was the rapid resolution of problems requiring military intervention. To this end, Constantius was to march on the usurper in Britain. Galerius, on the other hand, would resolve border conflicts with the Persians.

3. Constantius Recaptured Britain

Constantius Chlorus (father of Constantine the Great) had been a high ranking commander in Maximian’s army. He drew lessons from the failed campaign against Britain. Therefore, he applied different tactics this time. He took control of all the ports in Gaul and blocked all the trade routes to Britain, therefore hitting Britain where it hurts.

Until then, Carausius ruled Britain successfully but his enemies took advantage of the fact that the island was isolated and assassinated him. The leading figure of the plot was a bureaucrat named Allectus and he declared himself as the new Augustus. However, his rule turned out to be a short one.

Constantius charged against the enemy. He divided his army into two to puzzle the enemy and he took Allectus by surprise by marching towards the enemy with General Asclepiodotus simultaneously. Therefore, the hardest operation (the recapturing of Britain) of its time was carried out successfully.

Constantius had recaptured Britain, and from now on his name would be known as the “Conqueror of Britain”. Constantine the Great would benefit greatly from his father’s prestige in the future.

4. Galerius’ Fight against the Persians

An emperor named Narseh became the ruler of Sasanians (Second Persian Empire) and he wanted to follow the footsteps of his father Shapur because his father attacked Antioch, a land that belonged to the Roman Empire, and he took the Roman Emperor Valerian hostage. And Narseh, in the same fashion, wanted to seize Syria and the nearby lands.

Galerius was after avenging Valerian who died under captivity. Moreover, he wanted the end Persians’ struggle for power over Syria too. The first clash of the two emperors turned out to be a disaster for the Romans. Galerius was beaten at the Battle of Carrhae (modern day Harran) and they withdrew to Antioch. Diocletian got mad at the result and pressured his subordinate Galerius to finish the task he started.

The second war (the Battle of Satala) took place in Armenia. Galerius was stronger thanks to the reinforcements from the Balkans and he was ready for the battle and the land structure was suitable for the legions. On the other hand, the movement area of the Persian cavalry, which was a decisive factor on the outcome of the former battles, was limited this time.

The Romans were the clear winners of this battle thanks to the conditions that were in their favor. Galerius’ fight against the Persians ended in victory, and even the Harem tent of Narseh’s wives and kids were seized. Therefore, Valerian, who died during his captivity, was avenged.

5. Abdication of the Emperor Diocletian

After 20 years’ of rule, Diocletian decided to abdicate the throne. He wanted the Tetrarchy that he established to continue. Therefore, he encouraged Maximian to abdicate the throne simultaneously. Even though Maximian was not so willing to do so, he had to accept his fate.

Therefore, Constantius in the West and Galerius in the East were promoted to being “Augustus”. However, Constantius, “the Conqueror of Britain”, lost his life just after one year of his promotion. Following his death, his son, Constantine was declared as “Augustus” by the Western army.

However, Galerius didn’t accept this fait accompli. He appointed Severus, his old friend from the army, as Augustus in the West and the young Constantine was his subordinate as Caesar. The young emperor who would be called “Constantine the Great” in the future took this promotion as satisfactory “for now”. Also, Maximinus Daia was appointed as Caesar in the East.

In short, while the senior emperors were Galerius and Severus, the junior emperors were Constantine and Maximinus Daia.

6. Rebellion against Severus

This was the new order, however, it didn’t last long. Severus, who ruled Italy and the surrounding lands, oppressed the people with heavy taxes. For this reason, a great rebellion broke out in Rome against Severus.

The commanders of the army took side with the public and they declared Maxentius, son of the former “Augustus” Maximian, as the emperor. Maxentius was already expecting to be appointed at least as Caesar after his father’s abdication and it was time to take what was his.

Maxentius moved to Italy, where his father ruled before, and grew stronger there. He defeated the usurper Domitius Alexander who declared himself as the emperor of Carthage and he annexed it. However, the senior emperor Galerius at Nicomedia didn’t approve Maxentius’ rule and ordered Severus to take Rome back.

However, as Severus was coming closer to lay siege to Rome, his soldiers were reluctant to fight on his side, because most of the Severus’ soldiers had served Maximian who was the former Augustus. They didn’t want to fight against his son Maxentius.

As Severus felt helpless, he wanted to fall back to Ravenna and gather men. However, he was too weak even to accomplish it. He surrendered to Maximian in exchange for his life to be pardoned. However, Maximian and his son Maxentius didn’t keep their promise and they killed Severus.

7. Galerius’ March on Italy

As Galerius received the news, he went mad. Galerius decided to march on Italy with his army to restore order for the Tetrarchy. However, he realized quickly that it wasn’t easy to seize Italy. The cities blocked their way and his moves became restricted. He had to withdraw his army in order not to have the same fate as Severus.

Galerius decided to get the advice of Diocletian who was enjoying his retirement days. It was nobody but Diocletian whose words would be listened in the days that Tetrarchy was in crisis. After all, Diocletian was the founder of Tetrarchy system.

After Galerius’ unsuccessful Italy campaign, a struggle for power began between the former emperor Maximian and his son Maxentius.  Maxentius was grateful to his father for helping him in his fight against Severus and Galerius. However, he didn’t want his father to overshadow his authority. As a result, Maximian was exiled from Italy as he did things against his son.

Maximian went to Galerius’ palace at Nicomedia and asked for refuge. Normally, Galerius would be expected to punish Maximian after what he did in Italy. However, as he didn’t want this incident to overshadow his upcoming meeting with Diocletian, he decided to bring Maximian with him to this meeting.

8. Tetrarchy Rule is Reorganized

The three emperors met after long years. Maximian begged Diocletian to come back. He wanted to rule as “Augustus” like before. However, Diocletian had no interest in going back to politics. And he warned Maximian not to meddle with Tetrarchy.

As a result of the meeting, the Tetrarchy rule was reorganized. According to the new system, Licinius became “Augustus” by Galerius’ recommendation. Meanwhile, Constantine and Maximinus Daia remained as Caesar. Constantine’s expectation to be appointed as Augustus didn’t come true and Maxentius was declared as usurper in Italy.

In short, while the senior emperors were Galerius and Licinius, the junior emperors were Constantine and Maximinus Daia.

9. Maximian Creates a New Problem

After being exiled from Italy by his son and not being welcomed well by Galerius in the East, Maximian decided to move into his son-in-law Constantine’s.

Constantine was married to the former Augustus Maximian’s sister Fausta. Therefore, he didn’t treat him badly despite his usurper son Maxentius. However, Maximian continued to create new problems here too. As he tried to provoke Constantine’s legions in Gaul against him, he was forced to commit suicide.

Maximian, who served as “Augustus” with Diocletian for 20 years and was also the co-founder of Tetrarchy system, became history. And soon the system they had established with Diocletian would also be history.

10. Tetrarchy after the Death of Galerius

Meanwhile, something unexpected happened and Emperor Galerius died. Galerius was the insurance of the Tetrarchy system and the death of Galerius plunged Rome into new crises.

“Caesar” Maximinus Daia declared himself as Augustus in the East and seized the capital Nicomedia. The other “Caesar” Constantine immediately declared himself Augustus as well. Therefore, the new order that was agreed in the meeting with Diocletian became obsolete in just a few years.

When all the rulers from his father’s era (Maximian, Diocletian, and Galerius) died, Constantine started thinking that his time to become the sole ruler came.

11. The Battle of the Milvian Bridge

Although I haven’t mentioned it so far, a new period that would change the fate of the Roman Empire began. Just in 20 years, the religion of the Roman Empire was going to change from Paganism to Christianity and the new capital was going to be Constantinople (Istanbul). The person who was going to make these changes was Constantine, the son of Constantius Chlorus.

Constantine’s steps to create a one-man rule started with beating his enemy Maxentius in the South. Constantine deployed most of his troops that he left in Britain, Gaul, and Spain and he began to march to Rome with his army of 30,000 soldiers.

He seized Torino and Milano with ease, but he faced a serious opposition at Verona. However, the way to Rome was open after the death of Pompeianus in the Battle of Verona, the most important man of Maxentius.

Although Maxentius decided to stay in defensive position till the last moment, he faced Constantine on the battleground by leaving Rome. The army of Maxentius was larger and he actually had a chance to beat Constantine.

However, the soldiers in Constantine’s army were strong soldiers who had great experience in years. Moreover, they were loyal to Constantine to the death. Maxentius’ soldiers, on the other hand, tended to panic if things went wrong, which was the case during the Battle of the Milvian Bridge.

Constantine’s troops destroyed Maxentius and despite being relatively fewer in numbers, they didn’t let the enemy surround them. Maxentius couldn’t take the pressure and he wanted to fall back to Tiber River and gather his power back. However, he couldn’t manage it.

Maxentius had actually fallen into his own trap. He had destroyed all the bridges so that Constantine could not cross, and there was only two bridges he could use to retreat. And they were almost a ruin, too. As the bridge that stood on weak ropes collapsed with hundreds of soldiers on it, the other soldiers ran to the stone bridge called the Milvian Bridge that was too narrow.

However, most of them were crushed and fell to the river. Maxentius was one of the people that fell into the river and he died by drowning. And Constantine was welcomed like a hero when he arrived Rome.

12. Licinius and Constantine

Constantine established a total rule over the Western Europe while Licinius was in power in the Balkans. These two rulers made a deal and the aim of the deal was to get rid of Maximinus Daia who controlled all the trade routes in the Middle East.

Maximinus Daia had taken control of the whole Middle East after the death of Galerius. Despite having a relatively large army, he was beaten by Licinius. Now only Licinius and Constantine remained of the Tetrarchy.

Meanwhile, Maximinus Daia was the only emperor who was still in favor of the polytheist Pagan religions and the Jupiter Cult. Following the victory of the Milvian Bridge, Constantine had declared the the Edict of Milan and he ended the mistreatment of Christians that lasted for 300 years. Licinius also appeared to be in favor of this decision.

13. Battle of Chrysopolis, the End of the Tetrarchy

Tetrarchy, which was founded by Diocletian, collapsed once and for all. As just before Tetrarchy was declared, there were two emperors on each side, which were Licinius in the East and Constantine in the West. However, although he wedded his daughter to Licinius and became relatives with him, Constantine had the desire to be the one and only emperor of the Roman Empire.

Licinius, on the other hand, was involved in an assassination attempt against Constantine and he basically put his head in a noose. Constantine won the battle against Licinius that took place in the Balkans (Adrianople) and a short period of peace phase began. However, the fierce treatment of Licinius towards the Christians caused a great reaction in the West.

Constantine wanted to end the co-ruling system permanently and by crossing the Dardanelles Strait (Hellespont) he crashed Licinius’ army that was in a defensive position on the Bosphorus. The army of Licinius fled to Chrysopolis (Uskudar) on the Asian Side and they were destroyed there at the Battle of Chrysopolis.

Licinius was taken as hostage and although he was forgiven by Constantine at first, he was executed later. According to some sources, the reason for the change of decision was his desire to gather an army and fight against Constantine.

Therefore, the last emperor from the Roman Tetrarchy Rule also became history and Constantine, who never lost a single battle on the battlefield till then, became the only ruler of the Roman Empire.

14. Foundation of Constantinople

Constantine disliked the old aristocracy of Rome. Moreover, Rome had already lost its function of being the center of the empire. During the Tetrarchy period, senior emperors such as Diocletian and Galerius lived in Nicomedia in the East.

Constantine decided to establish a new capital. While fighting Licinius, he realized the strategic importance of the Bosphorus and admired the natural protection Byzantium provided.

Byzantium was declared the new capital and was completely rebuilt in 6 years. The foundation of Constantinople was celebrated with ceremonies in 330. The most important buildings of the new capital were the Hippodrome of Constantinople, the Forum of Constantine and the Church of the Holy Apostles.

15. The Byzantine Empire

Constantine’s move of the Roman Empire’s power center to the east allowed the Roman cult to survive for another 1000 years. Combining the administrative, military and architectural foundations of Rome with the Ancient Greek culture, the Byzantine Empire lived until 1453.

Although the “Eastern Roman Empire” is referred to in modern history as the Byzantine Empire, they had always considered themselves the Romans and successors of Constantine the Great.

References

While writing this article, I benefited from Mike Duncan‘s The History of Rome podcast and John Julius Norwich‘s book called Byzantium. I used online encyclopedias like Wikipedia and Britannica to double check some of the information.

I would also like to thank those who prepared the anonymous maps about the history of the Roman Empire. Thanks to these colorful maps, it was possible to explain visually the distribution of authority and area under the Tetrarchy.

Finally, in the update I made in 2025, I used images created with artificial intelligence. Thanks to visual generator AI engines such as Canva, Leonardo AI and Dalle, history writings came to life.

Roman Tetrarchy Map and Civil Wars by Serhat Engul

The post Civil Wars of the Tetrarchy in Rome (With Maps) appeared first on Istanbul Clues.

Since St. John has an important reputation in the Christian world, it is worth mentioning the situation of Christianity in those years. As it is known, after Jesus’ death in 30 BC, his apostles began to spread Christianity to the world. They established the first churches in the most important cities of Antiquity such as Alexandria, Antioch, Ephesus and Rome.

The Roman Empire, the world’s greatest political force, did not welcome the spread of Christianity and responded cruelly. The oppression and persecution against Christians lasted for nearly three centuries. Finally, in 313, Christianity was released with the Edict of Milan issued by Emperor Constantine. Even Constantine himself became a Christian. (according to traditional belief)

Christians, who had been persecuted until the reign of Emperor Constantine, could now live their religious life freely. With the decisions taken at the Council of Nicea in 325, Christian centers were determined. Accordingly, Rome, Constantinople, Antioch, Jerusalem and Alexandria would be the main episcopal centers.

Along with the freedom of belief, there has been tremendous progress in Christian philosophy. Early bishops laid the foundations of the rituals of worship that are still practiced in churches all over the world today. John Chrysostom was born just in such a convenient time and engraved his name in the history of the church in capital letters.

Life Story of St. John Chrysostom

The life of Saint John Chrysostom (aka Ioannes Chrysostomos) was full of hardship and struggle. Born in 349 in Antioch, John lost his father, an officer, at an early age and was raised by his mother. Anthusa, who had a strong character, helped his son John receive a very good education. John was raised in the hands of Libanius, one of the best orator of the time.

John, who had a great passion for Christianity at a young age, chose to lead an ascetic life. Starting to live in the monastery as a monk, John concentrated primarily on self-discipline. During the monk’s life, John only ate enough food to survive and slept for several hours a day, devoting all his time to praying. However, this ordeal lasted 6 years between 375 and 381, caused permanent damage to John’s stomach and liver.

John’s health began to deteriorate and he decided to return to Antioch and serve in the church. He would continue his life as a deacon. During the years he served the church, he gave great sermons and gained a great reputation among the people of the city. John, who supported his early oratorial education with a simple discourse that appealed to the public, succeeded in influencing everyone, whether Christian or not.

1. Priesthood Years in Antioch

Raising the priesthood in 386, John’s area of ​​responsibility expanded. He served in the Golden Church in Antioch between 386 and 397 years. He was loved by the public for conveying the teachings of the Bible to the daily life. For example, the sermons in Alexandria, the second most important church in the East at the time, were confusing because it contained abstract concepts. In contrast, John’s narratives in Antioch were simple enough to inspire people’s own way of life.

A rebellion against the Emperor Theodosius I erupted in Antioch during John’s priesthood. During the rebellion that soon spread throughout the city, the statues of the emperor were destroyed. John, who gave 20 long sermons during the rebellion, made a great effort to calm the events. Thanks to John’s passionate oratory, the people of the city calmed down and the rebellion ended. Theodosius I, who took away all the privileges of Antioch and reduced it to the status of a town with his first anger, stepped back and returned the rights of the city.

John, whose fame spread throughout the empire, became known as Chrysostomos, which means “Golden Mouth”. His success paved the way for his appointment as Archbishop to Constantinople, the capital of the Eastern Roman Empire. He would continue to serve as the highest-ranking clergyman in the capital.

2. Archbishop of Constantinople

This was unexpected for John Chrysostom when he was appointed Archbishop of Constantinople. When John came to the capital, the first thing he observed was the flamboyant life of the people. In his sermons he criticized the life of the rich and stressed that they should share their wealth with the poor. He refused to participate in the flamboyant dinners he was invited to. He criticized luxury clothes and lifestyle.

John’s homilies, which recommended living a simple life, received great interest and appreciation from the poor. On the other hand, it also disturbed the rich. In addition, his reforms within the church were not welcomed by the church staff. John quickly made many enemies in the imperial capital of Constantinople.

John’s criticism also reached the palace, the peak of this lavish lifestyle. Even Empress Aelia Eudoxia was the target of John’s arrows of criticism. However, clashing with Emperor Arcadius and his wife Aelia Eudoxia would have caused John Chrysostom much harm in the long run.

3. Conflict with Alexandria

Theophilus, the Patriarch of Alexandria at the time, wanted to influence Constantinople. However, the presence of a popular person like John prevented him from achieving this goal. John welcomed the priests who had fallen into a theological dispute with Theophilus and hosted them in Constantinople. This gave Theophilus the opportunity to take action against John.

The exiled priests supported the teachings of Origin, which were incompatible with Orthodox Christianity. For this reason, they were condemned by the patriarch. Theophilus made the same accusation against John, who hosted these priests known as the Tall Brothers.

Constantinople was in conflict with Alexandria, and there were great accusations. Council of clergy gathered to reveal who was right. John, who had many enemies among the influential people, was exiled by the decision of the council. Of course, Empress Aelia Eudoxia had an impact on the outcome of this trial against John.

John Chrysostom was exiled into Anatolia. However, the night he left the city, there was a terrible earthquake. Everyone was scared, including the Empress. This disaster was interpreted by the people of the city as the wrath of God. Therefore, John was recalled and his position and reputation restored. But peace would not last long.

Aelia Eudoxia continued the same flamboyant life and John continued to criticize. A statue of Aelia Eudoxia was erected in the square near Hagia Sophia, the most sacred temple of the period. For John, this was clearly an insult. John suggested that Aelia Eudoxia brought back pagan rituals. This time the conflict would have irreversible consequences.

4. Exile from Constantinople

John Chrysostom was first exiled from Constantinople to Cappadocia. However, the people of the capital protested this decision. After a while, the protests turned into clashes. A fire broke out in Hagia Sophia (1st generation building) due to riots in the city and the church was devastated.

Emperor Arcadius decided to exile John further because of events in the capital. This was also due to the fact that John complained about the emperor and the empress to the Pope and the leading religious authorities of the time. John’s letters to religious authorities such as Rome, Milan and Aquileia disturbed the palace. Because many religious leaders, especially the Pope, condemned the emperor for his actions.

John died on his way to the exile in Georgia. (407) He had severe illnesses from his days as a monk, and his body could not bear this journey. Ironically, Empress Eudoxia died shortly thereafter.

5. The Legacy of St. John Chrysostom

The influence of John Chrysostom in the capital continued after his death. So much so that during the reign of Emperor Theodosius II, son of Arcadius and Eudoxia, his relics were brought back to Constantinople (438) and moved to The Church of the Holy Apostles, where members of the royal family were buried.

During the Sack of Constantinople, which took place in 1204, the relics of the city’s greatest Saints Gregorius and John were stolen. St John’s relics had remained in St. Peter’s Basilica for centuries. In 2004, the relics were returned to the Patriarchal Church of St George in Istanbul as a sign of goodwill by the Vatican.

The legacy of St John Chrysostom has survived to this day. The sermons and liturgy of John Chrysostom are highly respected in both Catholic and Orthodox churches. The Ecumenical Patriarchate in Istanbul attributes many historical monuments (the patriarchate throne and pulpit) to him. He is still considered a very popular saint in the Christendom.

Conclusion

While writing the life story of John Chrysostom, I used images that I generated with artificial intelligence to stimulate the imagination of readers.

There may be some historical errors in these images created by ChatCPT based on my written descriptions. I apologize to those who are sensitive about religious issues for any misunderstandings that may occur.

However, I believe that these images, although imperfect, make the life story of this important figure more vivid and interesting.

Written by Serhat Engul

The post Life Story of ST. JOHN CHRYSOSTOM of Antioch appeared first on Istanbul Clues.

Tekfur Palace is located in the far corner of the Historical Peninsula. While other Byzantine works such as Hagia Sophia and Basilica Cistern are located in Sultanahmet, Tekfur Palace is located on the shores of the Golden Horn.

Tekfur Palace, which is within walking distance from the Chora Church (famous for its Byzantine mosaics), is a tile museum today. Although there is not much about Byzantium in it, Tekfur Palace promises a medieval experience with its mystical atmosphere.

From Great Palace to Palace of Blachernae

Great Palace, a 4th century structure, lived its golden age in the period between Constantine the Great and Justinian I. You can see the Roman era Istanbul in the picture above. The buildings to the east of the Hippodrome in the visual are parts of the Great Palace.

Great Palace’s world famous beauty lost its charm as it started to wear off in 11th century. The Palace of Blachernae, which consisted of a few mansions and expanded over time, became more and more popular.

Even though the Great Palace remained standing, some emperors such as Justinian II and Manuel I Komnenos preferred to live in the Palace of Blachernae. With its walls and pillars covered with reliefs, gold and silver; this new palace was praised to the skies by historiographers of Byzantine period.

When Constantinople, the most populous and most civilized city of the Middle Ages was invaded by Latins between years of 1204-1261, the Great Palace fell into ruin completely. Known as “Tekfur Sarayi” today, Palace of Blachernae was the only palace that emperors used permanently after the collapse of the Great Palace.

Yet, Palace of Blachernae was also affected by the plunder during Sack of Constantinople (1204) The magnificent throne that jewelled with precious stones in the palace was gone.

After the Latin occupation between 1204-1261, Byzantine Empire could survive only like a shadow of its past. They were using only earthenware even in feasts in the palace.

It seemed flamboyance of the past was gone for ever. Ottomans found a city that couldn’t pick up its pieces after the devastation occured 200 years ago when they captured Constantinople in 1453.

Palace of Blachernae in Ottoman Era

The Palace of Blachernae continued for a while during the Ottoman period. However, the Ottoman sultans had decided to live in the area where the Great Palace used to be. While Topkapi Palace, built in the east of the Historical Peninsula, rose, the Palace of Blachernae disappeared over time.

After visiting the city in the early periods of Ottoman Istanbul, Petrus Gyllius, a Byzantine historian, reported that the palace had still been standing. Moreover, Piri Reis, a famous Ottoman navigator, portrayed this palace in his map. According to some historians, exotic animals such as elephants and giraffes that were used in feasts in Istanbul were fed in the gardens of this palace.

Today, there is only one building (Palace of Porphyrogenitus) left from Palace of Blachernae. The building that survives today is named after the emperor Constantine VII Porphyrogenitus, who lived in the 10th century.

When we look at the historical depictions of the Palace of Blachernae, we conclude that this building was a very small part of the palace.

Restoration of Palace of the Porphyrogenitus

The restoration of the Palace of Porphyrogenitus took many years. The old palace, which was opened as the “Tile Museum” after the work done, gives us important clues about the medieval Byzantine architecture.

Ottomans had founded a tile workshop at this palace in 18th century to revive tile art that was at its peak in the rise of the empire but began to decline afterwards. Tekfur Palace Tile Museum exhibits Turkish ceramics and glass art referring to that Ottoman period.

When you visit the museum, you will notice that this medieval structure still preserves its mystical apmosphere. You will notice that the museum overlooks the city like an eagle’s nest and you will be able to watch the Golden Horn from its windows.

Tekfur Palace Museum Entrance Fee 2024

Tekfur Palace Museum entrance fee is 50 Turkish Lira as of 2024. The Museum is also known as Palace of the Porphyrogenitus in the Byzantine history. Istanbul Museum Pass is not valid for this museum. The information on the ticket price was last updated on May 7, 2024.

Tekfur Palace Museum Opening Hours 2024

Tekfur Palace Museum opening hours are between 09:00 and 17:00. Please note that The Palace of the Porphyrogenitus, known locally as Tekfur Sarayi is closed on Mondays. Information on visiting hours was last updated on May 7, 2024.

Visiting times of museums in Istanbul may change due to events and renovations. Before going to the museum, I recommend you to visit official website of the museum and review the latest situation.

How to Get to The Museum?

In order to get to Tekfur Palace Museum (Palace of the Porphyrogenitus), you need to reach Ayvansaray district on the coast of Golden Horn. You can reach the museum on foot from Chora Church, one of the best known Byzantine sites in Istanbul.

Those coming from Taksim can come to Golden Horn by M2 metro and reach the museum by walking from there. If you get off the M2 at the metro bridge known as “Halic”, there will be many Byzantine artifacts around you.

Church of Christ Pantocrator (Zeyrek Mosque), Church of St. George (Greek Orthodox Patriarchate) and Chora Church (Kariye Mosque) are also in the vicinity of Tekfur Palace. These works on the less touristic West side of the Historical Peninsula can be visited on foot in half a day.

Those coming from Sultanahmet can go to Eminonu (around the Spice Bazaar) by tram and then take buses in the direction of Ayvansaray. In fact, one can go to Tekfur Palace on foot from Eminonu, but the streets are quite winding and complicated.

Conclusion

Although Tekfur Palace is a young museum, it offers us important clues about Byzantine history and architecture. For this reason, it is among the best museums in Istanbul.

After visiting Tekfur Palace, you can also visit other nearby museums located on the shores of the Golden Horn. Among them, Rahmi Koc Museum in Haskoy and Miniaturk Museum in Sutluce are particularly recommended.

If you want to learn more about the museums in Istanbul, you can find dozens of similar articles in the Museums of Istanbul category of this site. Nearly 40 museums are introduced under this category.

Written by Serhat Engul

The post Palace of Porphyrogenitus (Tekfur Palace Museum) 2024 appeared first on Istanbul Clues.

The museum is located in Sultanahmet, Istanbul’s most touristic district. In order to reach the underground cistern, you enter a modern-designed glass room and go down the stairs.

Theodosius Cistern entrance fee is 650 Turkish Liras in 2025. Museum Pass Istanbul is not valid in the cistern. The Cistern is open between 09:00 in the morning and 19:00 in the evening. This information was last updated on December 1, 2024.

If you would like to buy a skip-the-line ticket for Theodosius Cistern, you can make a reservation for a guided group tour via this link. These online tickets can save you from waiting at the ticket booths during the spring and summer months.

In order to tell the history of the cistern properly, we will have to mention the Ancient Greek and Roman periods. So let’s start our short story by talking about ancient Istanbul.

Shortage of Water in Byzantium

Foundation legend of Istanbul dates back to Ancient Greece. Upon departing the city of Megara close by Gulf of Corinth, Byzas and his company came to Seraglio Point (Sarayburnu) and established Byzantium on the hill where Topkapi Palace resides now.

Shortage of water supplies was not a problem for this small community because only a few thousand people resided there at that time. However, after Byzantium was reconstructed and became Constantinople as the second capital of Roman Empire, population explosion caused significant water shortages.

Roman emperors found a solution for this within a few generations. Emperor Valens created the largest water network ever seen and built the Valens Aqueduct, which would bring water to Constantinople through Thrace.

The water shortage in Byzantium seemed to have been solved thanks to the aqueduct built by Valens. But they needed to sustain the flowing water. For that purpose, tens of cisterns were built in the following centuries. Basilica Cistern is no doubt the most famous among them.

Byzantine Cisterns in Istanbul

Until recently, the Basilica Cistern was the only structure that could be visited among the Byzantine Cisterns in Istanbul. Now Theodosius Cistern is among the most valuable museums of Istanbul thanks to eight-year-work of Istanbul Metropolitan Municipality.

If you want to trace thousands of years of Roman-Byzantine history, you can find several more hidden Byzantine cisterns in Istanbul. One of them is the Cistern of Philoxenos, also known as the Binbirdirek Cistern. Binbirdirek is open to visitors only for private events.

The first of the other two is the cistern on Sogukcesme Street, known as Sarnic Restaurant (a 1500-year-old cistern serving as a restaurant) and the last is the Nakilbent Cistern under the Nakkas Carpet Store. There is a magnificent exhibition about the history of chariot races in Constantinople in the cistern on Nakilbent Street.

The History of Theodosius Cistern

The history of the Theodosius Cistern dates back to the 5th century and takes its name from its founder, Emperor Theodosius II. This emperor has an important place in Byzantine history due to his architectural contributions to the city of Constantinople.

To exemplify, Walls of Constantinople (also known as Theodosian Walls) that guarded the city from any kind of threat for ages, was constructed under his reign. Thanks to these walls, Constantinople survived for a thousand years despite the endless attacks of Huns, Persians, Arabs and Bulgarians.

Additionally, we need to keep in mind that it was himself who reconstructed 2nd generation Hagia Sophia. Theodosian Hagia Sophia was demolished during the Nika Revolt which broke out in 532, and Emperor Justinian built the 3rd generation Hagia Sophia that still stands today.

The construction of Theodosius Cistern took nearly 15 years, from 428 to 443. It was crucial for rulers to supply non-stop water in Sultanahmet area because it was the center of the capital in Roman, Byzantine (and even Ottoman) era.

The cisterns we have mentioned in this post were the main cisterns that supply water to the Great Palace, Hippodrome, Hagia Sophia and to several official buildings in Constantinople. For those who want to know more about this, here is a great documentary released by Byzantium 1200.

Theodosius Cistern Entrance Fee 2025

Theodosius (Serefiye) Cistern entrance fee is 650 Turkish Lira as of 2025. The ticket price includes the light show you can watch inside. Museum Pass Istanbul is not valid in Theodosius Cistern. The information on the ticket price was last updated on December 1, 2024.

The Museum Pass Istanbul, a product of the Ministry of Culture and Tourism, is not valid in museums run by the Istanbul Metropolitan Municipality. The other museums in this category are the Basilica Cistern, the Miniaturk Museum, the Panorama 1453 Museum and the Tekfur Palace Museum respectively.

Theodosius Cistern Opening Hours 2025

Theodosius (Serefiye) Cistern opening hours are between 09:00 in the morning to 19:00 in the evening as of 2025. The museum can be visited every day of the week. Information on visiting hours was last updated on December 1, 2024.

Since there is a light show in the cistern, visitors are taken every hour. If you go at a random time, you may have to wait at the door until visitors are admitted during the show time. For example, if you are going to visit the cistern for the light show at 10:00, it is recommended to be there around 9:50. However, if you go at 9:30, you may have to wait for half an hour.

Visiting times of museums in Istanbul may change due to events and renovations. There can be concerts at weekends at the Serefiye Cistern. Before going to the museum, I suggest you visit the official website of the Cistern and review the latest situation.

How to Get to the Cistern?

In order to get to the Theodosius Cistern you need to find Piyer Loti Hotel which is located on Divanyolu Street (tramline street in Sultanahmet) and then you need to enter Piyer Loti Street.

In order to find the Piyer Loti Street, you need to take the Sultanahmet Tram Station behind you and walk in the direction of the next tram stop which is called as Cemberlitas Tram Station. Before you arrive at Cemberlitas where Column of Constantine (Burnt Column) stands, you’ll see the cafeteria of Piyer Loti Hotel on your left.

When you enter the street adjacent to the cafe under Piyer Loti Hotel, go straight ahead. You’ll realize a steel construction building at the square. That elegant building covered in glass is the entrance to the cistern.

Written by Serhat Engul

The post Theodosius Cistern (Serefiye Sarnici) Updated → 2025 appeared first on Istanbul Clues.

I have been a licensed tour guide in Istanbul for over 20 years, and for much of that time I have led private Byzantine-themed tours for travelers from around the world who want to understand the city beyond its famous landmarks. For anyone seriously interested in Byzantine history, the mosaics displayed here are not decorative leftovers; they are primary historical evidence that helps explain how imperial Constantinople actually functioned as a lived-in palace complex.

In this guide, I focus on the historical context of the Great Palace, the significance of its mosaic program, and what visitors should realistically expect from the site. Practical details such as entrance information and visiting logistics are included for reference, but the real value of this museum lies in how it connects everyday life, imperial ideology, and urban history within the Byzantine capital.

If your main interest is Byzantine mosaics, it’s worth noting that this artistic tradition can still be experienced elsewhere in Istanbul. Sites such as Hagia Sophia and the Chora Church preserve some of the most remarkable surviving mosaic programs from the Byzantine period and remain accessible to visitors.

History of the Great Palace (Constantinople)

The story of the Great Palace of Constantinople begins in the early 4th century, but its roots are inseparable from the Roman transformation of Byzantium. For nearly 800 years, Byzantium had existed as an independent Greek colony before coming under Roman control in 195 AD, a turning point that set the stage for the city’s imperial future.

As a local guide, I chose to begin this article by tracing the city’s story back to these Roman foundations and the rise of the Great Palace itself, in order to provide a clear historical background before focusing on the mosaics. If your main interest is the artworks, you may prefer to continue to the middle section devoted entirely to the mosaics.

1. Rome Arrives in Byzantium

The first Roman emperor to leave a lasting mark on the city was Septimius Severus. His arrival in the late 2nd century was far from peaceful. Byzantium had supported his rival, Pescennius Niger, and Severus responded by besieging and severely damaging the city.

Yet once the punishment ended, Severus recognized Byzantium’s strategic value. He ordered the city to be rebuilt and introduced its first Roman urban elements. At this stage, however, Byzantium was still a peripheral city within the vast Roman world.

2. Civil Wars and Strategic Awakening

Byzantium’s true importance emerged during the civil wars of the Tetrarchy, when multiple emperors fought for control of the empire. These conflicts brought the city to the center of imperial politics, particularly during the struggle between Constantine the Great and Licinius.

As Constantine advanced toward sole rule, Licinius used Byzantium’s defensible position—protected by sea and narrow land access—to his advantage. Eventually retreating to the Asian side of the Bosphorus, Licinius was decisively defeated at the Battle of Chrysopolis (Üsküdar). With this victory, Constantine ended the civil wars and emerged as the sole emperor.

3. The Birth of a New Capital

It was during this conflict that Constantine fully grasped the city’s potential. The peninsula’s natural defenses, combined with the Golden Horn acting as a secure inner harbor, made Byzantium uniquely suited to become an imperial capital. Constantine concluded that once strong land walls were constructed, the city would be virtually impregnable.

In 324 AD, he made a bold and controversial decision: to move the capital of the Roman Empire eastward. Many contemporaries were surprised, as Byzantium was not yet a major metropolis. History, however, proved Constantine’s vision correct. Constantinople soon became the most important political and commercial center of the Eastern Mediterranean.

4. “New Rome” and the Rise of the Great Palace

Constantine launched an ambitious reconstruction program, sending architects, engineers, and artists to reshape the city. Within a few years, Byzantium was officially proclaimed Nova Roma—the “New Rome.” At the heart of this transformation stood two monumental complexes: the Hippodrome and the Great Palace.

Stretching from the area of today’s Blue Mosque down toward the Sea of Marmara, the Great Palace formed an enormous ceremonial and residential complex. Mosaic-paved courtyards, churches, reception halls, pavilions, and even sporting grounds were woven together into a continuous imperial landscape.

5. From Imperial Residence to Ruin

From the 4th to the 11th century, Roman and later Eastern Roman emperors ruled from the Great Palace. Over time, however, imperial life gradually shifted northward toward the Blachernae Palace near the Golden Horn. The decisive blow came in 1204, when the Fourth Crusade devastated Constantinople.

During the 57-year Latin occupation that followed, the Great Palace fell into ruin. When the Byzantines finally reclaimed the city in 1261, there were neither the resources nor the political stability needed to restore this once-majestic complex. What remained slowly disappeared beneath later layers of the city—until fragments of its mosaic floors resurfaced centuries later, offering a rare glimpse into the heart of imperial Constantinople.

Things to See in Istanbul Mosaic Museum

The mosaics displayed in the Great Palace Mosaic Museum are among the most remarkable remnants of Byzantine art that survived from the Great Palace of Constantinople.

Dating back to the 5th and 6th centuries, they once decorated the floors of a large courtyard in the imperial complex — an area estimated to have covered nearly 2,000 m². Only a fragment of that grand mosaic pavement remains today, but what survives is enough to convey the refinement, imagination, and daily life of the Byzantine world.

1. The Mosaic Floor – A Journey Through Time

Walking through the museum feels like stepping onto the palace floor of an emperor. Each tessera (small stone piece) was hand-placed to form a vivid scene, using limestone, colored marble, and terracotta. The surviving section shows a lively world that is surprisingly secular — there are no saints or halos here, only scenes of nature, myth, and human life. This sets it apart from the religious mosaics of churches like Hagia Sophia or Chora.

2. Mythological and Animal Scenes

The mosaics are full of movement and drama. Lions, elephants, horses, and griffins are locked in fierce battles. A lion is seen attacking an elephant; an eagle swoops down on a snake; a griffin devours a lizard. These motifs may symbolize the eternal struggle between good and evil, or perhaps they simply reflect the Byzantine fascination with exotic beasts and far-away lands.
Between these wild encounters, you’ll also find peaceful glimpses of rural life: a shepherd leading his flock, a boy feeding a donkey, or children playing with geese. Such details reveal a softer side of Byzantine art — the joy of everyday scenes rarely captured elsewhere.

3. Technical and Artistic Details

The craftsmanship of these mosaics is astonishing. Some panels feature intricate “opus vermiculatum” patterns, where each tiny stone follows the contour of a figure, creating fluid motion and depth. The color palette is dominated by natural tones — ochre, ivory, black, and deep red — chosen to give the figures a lifelike sense of warmth and volume. Unlike many other Byzantine artworks, these mosaics were never framed by geometric borders; instead, one scene flows seamlessly into the next, creating a continuous narrative across the floor.

4. The Museum Setting

The museum itself is modest in size but atmospheric, located beneath the Arasta Bazaar, just behind the Blue Mosque in Sultanahmet. The lighting is soft, allowing you to focus on the delicate details of the mosaics. Informative panels explain the historical context, while a walkway above the ancient floor lets you view the artworks closely without damaging them. A visit here offers an intimate, almost contemplative experience — a quiet contrast to the bustling streets of Sultanahmet above.

5. Highlights Not to Miss

If you have limited time, make sure you notice:

• The Lion and Elephant Scene – the most dynamic and dramatic composition.
• Mare Nursing Her Foal – a tender portrayal of maternal instinct in nature.
• Boy Feeding a Donkey – a charming everyday image that brings warmth to the imperial setting.
• Griffin Devouring a Lizard – one of the finest mythological depictions, rich in detail and motion.

Each of these mosaics tells a fragment of a lost imperial world — a place where art bridged the realms of myth and reality. Though the museum is currently under restoration, its mosaics remain one of the most vivid links to the grandeur of Constantinople’s Great Palace, waiting to be rediscovered by the next generation of visitors.

Great Palace Mosaic Museum Entrance Fee (2026)

The last listed entrance fee for the Great Palace Mosaic Museum was 10 Euros.
At that time, the Museum Pass Istanbul was also accepted.

This pricing information reflects the museum’s status before its closure and was last verified in April 2026, when the site was still open to visitors. Please keep in mind that ticket prices may change once the restoration is completed and the museum reopens.

Great Palace Mosaic Museum Opening Hours (2026)

Before its closure, the Great Palace Mosaic Museum was open daily from 09:00 to 19:00, including weekends.

These opening hours were last recorded in April 2026, based on the museum’s most recent operational schedule. As with entrance fees, visiting hours may be revised following the completion of restoration work.

Museum schedules in Istanbul can change due to restoration projects, official events, or seasonal adjustments.
Before planning your visit, it is always advisable to check the museum’s official channels for the most up-to-date information—especially once reopening dates are announced.

How to Get to the Great Palace Mosaic Museum?

The Great Palace Mosaic Museum is located inside the Arasta Bazaar, directly behind the Blue Mosque in the Sultanahmet district.

The easiest way to reach the museum is to enter the Arasta Bazaar from Sultanahmet Square and walk along its main corridor. Unlike larger covered bazaars such as the Grand Bazaar, Arasta is an open-air, linear marketplace, making it easy to navigate even for first-time visitors.

As you walk through the bazaar, directional signs clearly point toward the Great Palace Mosaic Museum. These signs lead you to a small courtyard where fragments of Byzantine-era columns mark the entrance area of the museum.

Even though the museum is currently closed for restoration, the location itself is easy to identify and lies directly on the natural walking route between the Blue Mosque and the southern edge of Sultanahmet.

Conclusion

The Great Palace Mosaic Museum occupies a unique place among Istanbul’s museums. Rather than overwhelming visitors with scale or spectacle, it offers something far more intimate: a direct visual connection to daily life in Byzantine Constantinople. The mosaics—rich in movement, detail, and symbolism—remind us that the Great Palace was not only an imperial residence, but a lived-in world shaped by routine, ceremony, and artistry.

For travelers interested in Byzantine history, this museum represents a crucial missing link between monumental structures like Hagia Sophia and the quieter, more human layers of the city’s past. It helps explain how emperors, courtiers, and craftsmen once inhabited the very ground beneath Sultanahmet, long before the Ottoman skyline took shape.

That said, it is important to note that the Great Palace Mosaic Museum remains closed due to restoration work in 2026. While it is unfortunately not possible to enter the museum at this time, the site itself is far from silent. Through the iron gates, visitors can still glimpse Byzantine-era column fragments in the courtyard, offering a subtle but powerful reminder of what lies beneath the modern city.

Moreover, the surrounding area continues to reward those interested in Byzantine history. Just a short walk away stands the Little Hagia Sophia Mosque, originally built in the 6th century as the Church of Saints Sergius and Bacchus during the reign of Emperor Justinian. Even the brick walls scattered throughout the neighborhood—often overlooked—are in many cases remnants of the Eastern Roman Great Palace complex itself.

In other words, while the museum doors may be closed, the history is still very much present. This part of Sultanahmet was once the heart of the Byzantine Empire, and with a careful eye, its traces can still be read in stone, brick, and ground. Istanbul rarely reveals its past all at once—but here, it quietly invites you to look closer.

The post Great Palace Mosaic Museum in Istanbul (2026 Update) appeared first on Istanbul Clues.

As a licensed tour guide specializing in Byzantine history, I have spent many years walking these streets and studying the surviving churches, cisterns, palaces, and fortifications of the Byzantine capital. Some of these monuments, such as Hagia Sophia and the Theodosian Walls, are immediately recognizable. Others, like forgotten palace fragments or underground cisterns, reveal themselves only to those who know where to look.

Most of the Byzantine sites in Istanbul date between the 4th and 15th centuries, when the city served as the political, religious, and cultural center of the Eastern Roman Empire. Although centuries of change have reshaped the city, these structures still preserve the architectural and historical framework of Constantinople.

In this guide, you will find the most important Byzantine churches, cisterns, palaces, monuments, and fortifications that can still be visited today. I also regularly update this list as restoration projects progress and previously inaccessible sites reopen to visitors.

If you are interested in exploring these sites with historical context and architectural insight, you can also contact me through the contact page to learn about my current Byzantine walking tours in Istanbul.

Byzantine Sites in Istanbul (2026)

Most surviving Byzantine monuments in Istanbul are located within the Historic Peninsula, the area once enclosed by the walls of Constantinople. This was the administrative and ceremonial center of the Byzantine Empire, where emperors ruled, patriarchs presided, and the daily life of one of the world’s greatest capitals unfolded.

The legacy of Byzantium here is not limited to a single type of structure. It includes monumental churches that shaped the development of Christian architecture, vast underground cisterns built to sustain the city during sieges, imperial palace complexes overlooking the Marmara Sea, and defensive walls that protected the capital for over a millennium. Together, these sites form the physical framework of Constantinople — a city that remained one of the most powerful urban centers of the medieval world.

The following list brings together the most important Byzantine sites in Istanbul that can still be visited today. Some stand as fully preserved monuments, while others survive as fragments integrated into the modern city. Each offers a direct connection to the architectural, political, and cultural history of the Byzantine capital.

1. Hippodrome of Constantinople

The Hippodrome was the ceremonial and political heart of Constantinople, long before the city was defined by its churches and domes. Built in the Roman period and expanded by Constantine the Great in the 4th century, it followed the model of Rome’s Circus Maximus and could hold tens of thousands of spectators who gathered here not only for chariot races, but for moments that shaped the fate of the empire.

These races were more than entertainment. The emperor watched from his private lodge overlooking the arena, while rival factions of the city — the famous Blues and Greens — turned the Hippodrome into a stage where sport, politics, and public opinion merged. When tensions erupted into violence, the consequences could be dramatic. The Nika Revolt of 532, the most destructive uprising in Constantinople’s history, began here and nearly brought down Emperor Justinian before the city was brutally brought back under imperial control.

Although the track itself has disappeared beneath the modern square of Sultanahmet, several monuments still stand along its central spine, preserving a direct link to the city’s imperial past. The Obelisk of Theodosius, carved in Egypt over 3,500 years ago, is the oldest surviving monument in Istanbul. Nearby, the Serpent Column, brought from Delphi in the 4th century AD, and the later Walled Obelisk mark the same axis where chariots once raced at full speed.

2. Great Palace Mosaic Museum

The Great Palace Mosaic Museum preserves one of the very few surviving fragments of the Great Palace of Constantinople, the vast imperial residence that stood at the center of Byzantine political life for over seven centuries. Built in the early 4th century after Constantine chose Byzantium as the new capital of the Roman Empire, the palace stretched across the slopes between the Hippodrome and the Sea of Marmara. It was not a single building, but an entire ceremonial landscape of courtyards, audience halls, private apartments, and chapels — a secluded imperial world overlooking the public arena of the city.

What survives today are the remarkable floor mosaics that once decorated one of the palace courtyards. These mosaics, now displayed in situ inside the museum, offer a rare and intimate glimpse into the visual culture of early Byzantine Constantinople. Unlike the later religious mosaics seen in churches, these scenes depict animals, hunters, rural life, and mythological figures. Lions chase their prey, children play among animals, and everyday moments unfold with extraordinary detail. They reflect a transitional moment in Byzantine art, when the classical artistic traditions of the Roman world were still very much alive.

Standing here, it becomes easier to imagine the scale and sophistication of the Great Palace itself. Just beyond these walls once stood the emperor’s private chambers, reception halls where foreign envoys were received, and corridors that connected directly to the Hippodrome, allowing the ruler to appear before the public in carefully staged ceremonies. Although the palace disappeared centuries ago, these mosaics preserve the quiet, human dimension of imperial life — not the grand rituals, but the artistic environment that surrounded them.

3. Hagia Sophia

Hagia Sophia was built in 537 under Emperor Justinian I, at a moment when Constantinople was still recovering from the devastation of the Nika Revolt. Determined to restore both the city and his imperial authority, Justinian commissioned two brilliant scholars, Anthemius of Tralles and Isidore of Miletus, to design a sanctuary unlike anything the world had seen before. When it was completed, its vast dome seemed to float above the city, redefining the possibilities of architecture for centuries to come.

For nearly 900 years, Hagia Sophia served as the spiritual and ceremonial center of the Byzantine Empire. It was here that emperors were crowned, victories were celebrated, and the religious life of the empire reached its highest expression. The building was not simply a church, but a symbol of Constantinople itself — a visible statement of imperial power, faith, and artistic achievement. Its scale and engineering were so advanced that comparable structures would not appear in Europe until the great cathedrals of the late medieval and Renaissance periods.

Although Hagia Sophia was converted into a mosque after the Ottoman conquest in 1453, much of its Byzantine character survives, especially in the upper galleries where the original mosaics remain visible. These mosaics — depicting Christ, the Virgin Mary, and Byzantine emperors — offer a direct connection to the building’s original function and the civilization that created it. Walking beneath the dome and then ascending to the galleries allows visitors to experience both the architectural ambition and the spiritual atmosphere that defined Byzantine Constantinople.

4. Hagia Irene

Hagia Irene is one of the oldest surviving churches in Constantinople, standing today within the first courtyard of Topkapi Palace, just a short distance from Hagia Sophia. Its origins date back to the reign of Constantine in the 4th century, when Christianity was still establishing its physical presence in the newly founded imperial capital. The church was rebuilt on a monumental scale under Emperor Justinian in the 6th century, but the structure seen today largely reflects its reconstruction following the earthquake of 740, during the period of Byzantine Iconoclasm.

This moment in history left a visible mark on the building. Unlike other major Byzantine churches, Hagia Irene was rebuilt with an unusually austere interior, free from the rich figurative mosaics that once defined imperial church decoration. Instead, a simple mosaic cross still dominates the apse — a powerful symbol of the Iconoclastic era, when religious imagery was restricted and abstract forms replaced human representation. Because of this, Hagia Irene preserves architectural and artistic evidence from a controversial chapter of Byzantine history that is rarely visible elsewhere.

The church also occupies an important position in the ceremonial and institutional life of the empire. It stood within the outer precincts of the imperial complex, close to the Great Palace and Hagia Sophia, forming part of the sacred and political core of Constantinople. In later centuries, after the Ottoman conquest, Hagia Irene was preserved within the palace grounds and used for imperial purposes rather than being converted into a mosque, allowing its Byzantine structure to survive largely intact.

5. Column of the Goths

Hidden among the trees of Gülhane Park, the Column of the Goths is one of the oldest surviving monuments from the Roman period in Istanbul. This solitary marble column, rising approximately 18.5 meters high, was erected in the late 3rd or early 4th century to commemorate a Roman victory over the Gothic tribes — powerful enemies who threatened the empire’s northern frontiers during Late Antiquity.

The column takes its name from a Latin inscription at its base, which honors Fortuna Redux, the goddess of victorious return, and celebrates the defeat of the Goths. Although the exact emperor responsible for the monument remains uncertain, many scholars associate it with the victories of Claudius II Gothicus or Constantine the Great, both of whom played decisive roles in stabilizing the empire during this turbulent era.

Its location is equally significant. The column stands on the northeastern edge of the ancient acropolis of Byzantium, overlooking the strategic point where the Bosphorus, the Golden Horn, and the Sea of Marmara meet. Long before Constantine transformed Byzantium into Constantinople, this elevated ground formed the ceremonial and symbolic heart of the city. The column may once have supported a statue — possibly representing the city’s legendary founder Byzas or the protective goddess Tyche — reinforcing its role as a monument of civic identity and imperial victory.

Unlike the grand churches and palaces of the later Byzantine period, the Column of the Goths belongs to an earlier layer of the city’s history, when Constantinople was still emerging as a Roman imperial capital. Its survival through centuries of transformation — from pagan Byzantium to Christian Constantinople and later Ottoman Istanbul — makes it a rare physical link to the city’s pre-Constantinian past. Standing quietly within the gardens that now surround Topkapi Palace, it marks a moment when the Roman world was still defining the future of this strategic crossroads between Europe and Asia.

6. Basilica Cistern (Yerebatan Sarnıcı)

The Basilica Cistern is the largest and most impressive of the many underground reservoirs that sustained Constantinople during its long history as an imperial capital. Built in the 6th century under Emperor Justinian I, at the same time as Hagia Sophia, it formed part of a vast infrastructure designed to secure the city’s water supply during periods of siege. In an age when Constantinople could be isolated for months or even years, these hidden reservoirs ensured the survival of one of the most important cities in the medieval world.

Descending into the cistern reveals a vast subterranean space supported by hundreds of marble columns rising from still, dark water. Many of these columns were reused from earlier structures, reflecting the Byzantine practice of incorporating materials from older monuments into new imperial projects. The careful symmetry of the columns, combined with the filtered light and reflections on the water, creates an architectural environment that feels both functional and ceremonial — a reminder that infrastructure in Constantinople was built on an imperial scale.

The cistern’s popular name, the “Sunken Palace,” reflects this unexpected grandeur. Among its most famous features are the carved Medusa heads that serve as column bases, likely reused from earlier classical buildings. Their presence illustrates how elements of the ancient Roman world were absorbed into the fabric of Byzantine Constantinople, often in ways that blurred the boundary between engineering and artistic expression.

More than a technical structure, the Basilica Cistern reveals the hidden systems that made life in Constantinople possible. While churches and palaces symbolized imperial power above ground, reservoirs like this sustained the city during its most vulnerable moments. Walking through its silent forest of columns offers a rare opportunity to experience the unseen foundations that supported one of history’s greatest capitals.

7. Theodosius Cistern (Şerefiye Sarnıcı)

The Theodosius Cistern, known locally as Şerefiye Cistern, was built in the late 4th or early 5th century during the reign of Emperor Theodosius II, one of the rulers who reshaped Constantinople into a fully developed imperial capital. This period saw major infrastructure projects, including the construction of the famous Theodosian Walls and the expansion of the city’s water system. The cistern formed part of this network, storing and distributing fresh water brought from distant reservoirs and aqueducts into the heart of the city.

Although smaller than the Basilica Cistern, the structure reflects the same advanced engineering principles that sustained Constantinople for centuries. Its rectangular chamber is supported by rows of marble columns connected by brick arches and vaults, creating a stable underground reservoir designed to hold a substantial volume of water beneath the densely built urban center. These cisterns compensated for the lack of natural freshwater sources within the historic peninsula, allowing the capital to withstand long sieges and support a large population.

The cistern’s location, near the Forum of Constantine and the main ceremonial route of the city, highlights its strategic importance. Water stored here would have supplied nearby public buildings, baths, and imperial institutions, forming part of the invisible infrastructure that kept the capital functioning. Like many Byzantine engineering works, it was both practical and carefully integrated into the urban fabric above.

8. Cistern of Philoxenos (Binbirdirek Sarnıcı)

The Cistern of Philoxenos, known today as Binbirdirek Cistern, is one of the oldest and largest surviving Byzantine reservoirs in Constantinople. It was built in the 4th century, most likely during the reign of Emperor Constantine or his immediate successors, at a time when the city was rapidly expanding as the new capital of the Roman Empire. Its original name refers to a high-ranking official, Philoxenos, who is believed to have overseen or commissioned the construction as part of the early imperial infrastructure.

The cistern consists of a vast underground chamber supported by more than two hundred marble columns arranged in regular rows, creating a dense architectural grid beneath the historic peninsula. These columns, connected by brick arches and vaulted ceilings, were designed to support the enormous weight of the city above while storing water brought through aqueducts from sources located many kilometers away. Like other cisterns in Constantinople, it played a crucial role in maintaining a reliable water supply in a city that lacked natural freshwater springs within its walls.

Unlike the Basilica Cistern, which features more elaborate architectural decoration, the Cistern of Philoxenos reflects an earlier phase of Byzantine engineering, where structural efficiency was the primary concern. Today, its forest of columns and quiet underground space offer a clear impression of the hidden infrastructure that sustained Constantinople during its rise as one of the most powerful cities of Late Antiquity and the medieval world.

9. Church of Sergius and Bacchus (Little Hagia Sophia)

The Church of Saints Sergius and Bacchus, known today as Little Hagia Sophia, is one of the earliest surviving imperial churches of Constantinople and a key monument from the reign of Emperor Justinian in the early 6th century. Built shortly before Hagia Sophia, this church reflects the same architectural ambition on a more intimate scale, offering valuable insight into the experimental phase that preceded Justinian’s greatest architectural achievement. Dedicated to two Roman soldier-saints venerated in the Eastern Christian world, the building formed part of a larger religious complex near the imperial palace.

Its interior reveals the defining features of early Byzantine architecture: a central domed space, elegant marble columns, and finely carved capitals bearing monograms and decorative motifs from Justinian’s time. The octagonal layout, crowned by a shallow dome, creates a sense of balance and harmony that would later be developed on a monumental scale in Hagia Sophia. Standing inside, it becomes clear that this church was not merely a smaller version of later buildings, but an important step in the evolution of Byzantine architectural design.

The church’s location near the shores of the Marmara Sea also reflects its connection to the ceremonial and residential heart of Constantinople. In the 6th century, this district formed part of the imperial landscape, where religious buildings, palace structures, and administrative centers were closely integrated. After the Ottoman conquest, the church was converted into a mosque, which contributed to its preservation and ensured the survival of its essential Byzantine structure.

10. Boukoleon Palace

The Boukoleon Palace was one of the principal imperial residences of Byzantine Constantinople, built along the Marmara Sea at the southeastern edge of the Great Palace complex. Its strategic waterfront location allowed direct access from the imperial harbor into the private quarters of the emperor, reinforcing the connection between the palace and the maritime routes that linked Constantinople to the wider Byzantine world. The name “Boukoleon” is believed to derive from a sculptural group depicting a lion and a bull, symbols associated with imperial strength and authority.

The palace developed gradually between the 5th and 10th centuries, reaching particular importance during the reigns of emperors such as Theophilos and Nikephoros II Phokas. Its sea-facing terraces, ceremonial halls, and private apartments formed part of a larger imperial landscape that stretched from Hagia Sophia and the Hippodrome down to the Marmara shoreline. Foreign envoys, dignitaries, and members of the imperial court would have entered the palace through its seaward gates, making it both a residential and ceremonial center of imperial power.

By the late Byzantine period, however, the political and defensive priorities of the empire shifted. Emperors increasingly preferred the Blachernae Palace near the land walls, which offered greater protection during an era of growing external threats. As a result, the Boukoleon Palace gradually fell into disuse, and after the Latin occupation of Constantinople in 1204 and the Ottoman conquest in 1453, much of the complex declined or disappeared.

Today, the surviving remains of the Boukoleon Palace — including sections of its sea walls, terraces, and structural foundations — still stand along the Marmara coast, just below the historic peninsula. Although only fragments remain, they preserve the outline of a residence that once formed part of the ceremonial and residential heart of the Byzantine Empire. Recent conservation efforts have aimed to stabilize and protect these ruins, highlighting the palace’s importance as one of the last visible links between Constantinople’s imperial center and the sea that sustained it.

11. The Forum of Constantine (Çemberlitaş)

The Forum of Constantine was one of the first monumental spaces created when Constantine the Great transformed Byzantium into his new imperial capital in the early 4th century. Conceived as the ceremonial and political center of “New Rome,” this circular public square stood along the city’s main avenue, the Mese, which connected the imperial palace to the land walls. It was here that imperial ceremonies unfolded, public announcements were made, and the symbolic identity of Constantinople as a Roman capital was established.

At the center of the forum rose the Column of Constantine, a massive porphyry column that still stands today in the district known as Çemberlitaş. Originally crowned by a statue of Constantine depicted in the manner of a Roman sun god, the monument embodied the fusion of imperial authority and classical symbolism that defined the early Byzantine period. The column itself was assembled from massive drums of porphyry, a rare purple stone reserved exclusively for imperial use, reinforcing the emperor’s association with Roman tradition and divine legitimacy.

The forum formed a key node along the Mese, the city’s principal ceremonial artery. Triumphal processions, imperial entries, and public gatherings passed through this space, linking it directly to other major squares such as the Forum of Theodosius and eventually to the Great Palace and Hagia Sophia. This sequence of monumental spaces structured the ceremonial geography of Constantinople, allowing the emperor to move through the city in carefully choreographed displays of power.

12. Valens Aqueduct (Bozdoğan Kemeri)

The Valens Aqueduct is one of the most visible and enduring components of the vast water system that sustained Constantinople as an imperial capital. Completed in the late 4th century during the reign of Emperor Valens, this monumental structure formed part of an extensive network of channels and bridges that carried fresh water from distant sources in Thrace into the heart of the city. At a time when Constantinople’s population was rapidly expanding, securing a reliable water supply was essential to maintaining urban life, public baths, imperial palaces, and the large cisterns that stored water beneath the city.

Stretching across the valley between two hills of the historic peninsula, the aqueduct originally measured nearly one kilometer in length and rose high above the surrounding landscape. Its carefully engineered arches allowed water to flow gradually downhill using gravity alone, demonstrating the advanced hydraulic knowledge inherited from Roman engineering traditions. The water transported by this system fed major reservoirs such as the Basilica Cistern and the Cistern of Philoxenos, forming an integrated infrastructure that allowed Constantinople to withstand long sieges and function as one of the largest cities of the medieval world.

Even after the end of the Byzantine Empire, the aqueduct continued to serve the city under Ottoman rule, when it became known as the Bozdoğan Aqueduct. Its continued use for centuries reflects the durability and effectiveness of the original Roman design. Today, the surviving arches rise above one of Istanbul’s busiest modern streets, creating a striking contrast between ancient infrastructure and contemporary urban life.

Standing beneath its massive stone arches, it becomes clear that structures like the Valens Aqueduct were just as essential to the survival of Constantinople as its walls, churches, and palaces. While less ceremonial than imperial monuments, this aqueduct represents the hidden systems that allowed the Byzantine capital to grow, endure repeated sieges, and remain one of the most important cities of its time.

13. Monastery of the Pantocrator (Zeyrek Mosque)

The Monastery of Christ Pantocrator was one of the most important religious complexes of late Byzantine Constantinople, built in the early 12th century during the reign of Emperor John II Komnenos and his wife Empress Irene. Unlike earlier imperial churches concentrated near Hagia Sophia, this vast monastic foundation reflected the shifting political and religious landscape of the Komnenian period, when new centers of patronage emerged beyond the original ceremonial core of the city. The complex consisted of three interconnected churches, forming one of the largest surviving Byzantine religious structures after Hagia Sophia.

More than a monastery, Pantocrator functioned as an imperial institution at the heart of Byzantine spiritual and political life. It served as the burial place of members of the Komnenos dynasty, reinforcing its role as a dynastic mausoleum as well as a place of worship. Contemporary sources also describe an associated hospital and charitable facilities, illustrating the broader social role monasteries played in Byzantine urban life. Through these functions, the complex became one of the most prestigious religious foundations in Constantinople during its final centuries as an imperial capital.

Architecturally, the surviving structure reveals the mature style of middle Byzantine design. Its layered domes, brickwork patterns, and carefully proportioned interior spaces reflect a period when Byzantine architecture had moved beyond the experimental forms of the 6th century into a more refined and balanced expression. The three churches — dedicated to Christ Pantocrator, the Virgin Eleousa, and the imperial mausoleum chapel — were integrated into a single monumental composition that dominated the skyline of the surrounding district.

After the Ottoman conquest, the complex was converted into a mosque and became known as Zeyrek Mosque, a function that contributed to its preservation over the centuries. Today, standing on one of the hills overlooking the Golden Horn, it remains one of the most prominent surviving Byzantine landmarks in Istanbul. Its elevated position and massive structure still convey the presence of a monument that once served not only as a place of worship, but also as a center of imperial memory during the final centuries of Byzantine Constantinople.

14. Pammakaristos Church (Fethiye Museum)

The Church of the Theotokos Pammakaristos was one of the most important monastic churches of late Byzantine Constantinople, particularly during the final centuries of the empire. Built between the 11th and 12th centuries and expanded in the Palaiologan period, the complex reflects the architectural and artistic revival that took place after the Byzantines recaptured the city from the Latin Crusaders in 1261. Its elevated location overlooking the Golden Horn placed it within one of the prominent religious districts of the later Byzantine capital.

The church gained even greater historical significance after the Ottoman conquest of 1453, when it became the seat of the Ecumenical Patriarchate for several decades. During this transitional period, it served as the spiritual center of the Orthodox Christian community in the Ottoman capital, preserving continuity with the Byzantine ecclesiastical tradition at a time of major political change. In the late 16th century, the main church was converted into a mosque under Sultan Murad III and became known as Fethiye Mosque, while one section of the original structure was preserved.

Today, the surviving parekklesion (funerary chapel) functions as the Fethiye Museum and contains some of the finest examples of late Byzantine mosaic art in Istanbul. These mosaics, dating from the 14th century, belong to the Palaiologan Renaissance, a period marked by renewed artistic expression following the restoration of Byzantine rule. Figures of Christ, the Virgin Mary, and biblical scenes are rendered with a greater sense of depth, movement, and emotional expression than earlier Byzantine works, reflecting the evolving artistic language of the empire’s final phase.

Architecturally, the church also preserves the characteristic features of middle and late Byzantine design, including its domed structure, brickwork patterns, and layered spatial composition. Although less monumental than Hagia Sophia or the Pantocrator complex, Pammakaristos offers one of the clearest insights into the religious and artistic life of Constantinople during its final centuries as a Byzantine capital.

15. Church of Saint Theodosia (Gül Mosque)

The Church of Saint Theodosia, known today as Gül Mosque, is one of the most atmospheric surviving Byzantine churches in Istanbul, located near the ancient sea walls along the Golden Horn. Built in the 11th century, during a period of renewed stability and artistic development in the Byzantine Empire, the structure reflects the mature architectural style of middle Byzantine Constantinople. Its tall dome and solid brick construction still dominate the surrounding neighborhood, preserving the presence of a monument that has stood here for nearly a thousand years.

The church was dedicated to Saint Theodosia, a Christian woman venerated for her resistance during the Iconoclast period of the 8th century, when imperial authorities attempted to suppress the use of religious images. According to Byzantine tradition, she was executed for defending an icon of Christ, and her memory became closely associated with the defense of sacred imagery during one of the most turbulent theological conflicts in the empire’s history. Over time, the church dedicated to her became an important place of devotion, particularly for those seeking spiritual protection and healing.

Architecturally, the building preserves key features of Byzantine church design, including its domed central space and carefully proportioned interior. Its position near the Golden Horn also reflects the historical importance of this district, which was densely populated during the Byzantine period and connected to the maritime defenses of the city. The church formed part of a religious landscape that extended along the northern edge of Constantinople, beyond the main ceremonial center near Hagia Sophia.

Following the Ottoman conquest, the structure was converted into a mosque and became known as Gül Mosque, a name traditionally associated with the roses that were said to decorate the church at the time of the conquest. Today, the building remains one of the lesser-known but most evocative Byzantine monuments in Istanbul. Its survival allows visitors to encounter a church that preserves not only the architectural language of Byzantine Constantinople, but also the memory of the religious struggles that shaped the spiritual identity of the empire.

16. Church of Saint George

The Church of Saint George, located within the courtyard of the Ecumenical Patriarchate in the historic district of Fener, represents the living continuation of a religious institution whose roots extend back to the Byzantine Empire. While the present structure largely dates to the Ottoman period, its significance lies in its role as the current seat of the Ecumenical Patriarch of Constantinople — the spiritual leader of Eastern Orthodox Christianity. This continuity links the church directly to the Byzantine tradition, when the Patriarch once presided from Hagia Sophia, the empire’s greatest sanctuary.

After the Ottoman conquest of 1453, the Patriarchate was permitted to continue its existence and gradually relocated through several former Byzantine churches before settling permanently at this site in the 16th century. Since then, the Church of Saint George has served as the administrative and spiritual center of Orthodox Christianity, preserving a line of ecclesiastical authority that traces back more than seventeen centuries. This continuity makes the church not simply a historical monument, but an active institution shaped by the legacy of Byzantine Constantinople.

Inside, the church preserves an extraordinary collection of sacred objects and relics associated with the Byzantine world. Among them are relics attributed to early Church fathers such as Saint John Chrysostom and Saint Gregory the Theologian, two of the most influential theological figures of Late Antiquity. The iconostasis, richly decorated with icons and gilded ornamentation, reflects the artistic and liturgical traditions that developed in Byzantium and continue in Orthodox worship today.

Although modest in appearance compared to the great imperial churches of the Byzantine period, the Church of Saint George carries a unique historical weight. It represents the survival of the Byzantine ecclesiastical tradition beyond the fall of the empire and into the present day. Visiting this church offers a rare opportunity to encounter not only the architectural legacy of Byzantium, but also the uninterrupted spiritual tradition that emerged from Constantinople and continues to shape Orthodox Christianity around the world.

17. Church of St Mary of the Mongols

The Church of St Mary of the Mongols is one of the most remarkable surviving Byzantine churches in Istanbul, not for its size or decoration, but for its uninterrupted continuity. Built in the late 13th century during the final phase of the Byzantine Empire, the church is closely associated with Maria Palaiologina, a member of the imperial dynasty whose life reflects the far-reaching diplomatic and cultural connections of Constantinople. After being married to a Mongol ruler as part of a political alliance and later returning to the capital, she founded this church and spent her remaining years within its monastic community.

Architecturally, the building reflects the refined style of the Palaiologan period, when Byzantine architecture emphasized balanced proportions, domed interiors, and carefully articulated brick construction. Although smaller than the great imperial foundations, the church preserves the spatial character and devotional atmosphere of late Byzantine monastic life. Its elevated position on the slopes overlooking the Golden Horn also reflects the continued expansion of religious institutions into the northern districts of Constantinople during the empire’s final centuries.

What makes this church truly exceptional is its fate after the Ottoman conquest. Unlike most Byzantine churches within the city walls, it was never converted into a mosque and continued to serve the Orthodox Christian community. This unique status is traditionally linked to an imperial decree issued in the 15th century that granted the church protection, allowing it to remain in continuous religious use. As a result, it represents the only Byzantine church in Istanbul that has functioned as an Orthodox place of worship without interruption from the Byzantine period to the present day.

Today, the Church of St Mary of the Mongols stands as a rare physical link between Byzantine Constantinople and modern Istanbul. Its survival preserves not only the architectural form of a late Byzantine church, but also the continuity of a religious tradition that endured through the profound political and cultural transformations that reshaped the city after the end of the Byzantine Empire.

18. Chora Church (Kariye Mosque)

The Chora Church preserves one of the most extraordinary surviving artistic ensembles of the Byzantine world, offering a rare window into the final flowering of Byzantine art during the 14th century. Originally founded as a monastery outside the walls of Constantine’s early city, the church later became enclosed within the expanded defenses built under Emperor Theodosius II. Its name, “Chora,” meaning “in the countryside” or “outside the city,” reflects this earlier landscape, when the site stood beyond the urban core of Constantinople.

The church reached its artistic peak during the Palaiologan period, when the scholar and statesman Theodore Metochites sponsored a comprehensive renovation of the building in the early 1300s. Under his patronage, the interior was adorned with mosaics and frescoes of exceptional narrative complexity and artistic refinement. These works depict scenes from the lives of Christ and the Virgin Mary, as well as theological themes central to Byzantine spirituality. Their expressive figures, dynamic compositions, and sophisticated use of light represent the culmination of centuries of Byzantine artistic development.

Unlike the vast and monumental scale of Hagia Sophia, Chora offers a more intimate artistic experience, where visitors can closely observe the storytelling quality of Byzantine religious art. The mosaics lining the inner and outer narthexes guide the viewer through a carefully constructed visual narrative, while the funerary chapel, or parekklesion, contains powerful frescoes reflecting Byzantine beliefs about death and salvation. Together, these spaces preserve one of the most complete surviving decorative programs from the late Byzantine period.

Following the Ottoman conquest, the church was converted into a mosque and later served as a museum for much of the 20th century, contributing to the preservation and study of its mosaics. Today, as Kariye Mosque, it remains accessible to visitors and continues to display its remarkable artistic heritage. More than any other monument in Istanbul after Hagia Sophia, Chora reveals the intellectual, spiritual, and artistic sophistication of Byzantine Constantinople during its final centuries.

19. Palace of the Porphyrogenitus (Tekfur Palace)

The Palace of the Porphyrogenitus, known in Turkish as Tekfur Palace, is one of the very few surviving examples of secular Byzantine architecture in Istanbul. Built during the late Byzantine period as part of the larger Blachernae Palace complex, it stood near the land walls at the northwestern edge of the city, an area that became the preferred imperial residence during the empire’s final centuries. As the political center of Constantinople gradually shifted away from the Great Palace near Hagia Sophia, the Blachernae district emerged as the new focal point of imperial life, and structures such as this palace formed part of that transformation.

The name “Porphyrogenitus,” meaning “born in the purple,” was traditionally associated with members of the imperial family who were born during their father’s reign, emphasizing their legitimacy as heirs. Although the precise date of construction remains debated, the palace is generally linked to the Palaiologan period, when Byzantine rulers maintained a reduced but still symbolically important imperial court. Its distinctive façade, built with alternating layers of brick and stone, reflects the refined architectural style of late Byzantine Constantinople, combining structural strength with decorative complexity.

Unlike the Great Palace and much of the Blachernae complex, which disappeared over time, this structure survived due to its continued use during the Ottoman period, when it served various functions, including workshops and storage. Its preservation allows visitors to encounter a rare fragment of the imperial residential architecture that once defined the political heart of Byzantium.

Today, restored and open as a museum, the Palace of the Porphyrogenitus offers a unique opportunity to visualize the final phase of Byzantine Constantinople. Standing beside the massive Theodosian Walls and overlooking the Golden Horn, it evokes a period when the empire, though diminished in territory, still preserved its ceremonial traditions within these last remaining imperial spaces.

20. Walls of Constantinople (Theodosian Walls)

The Theodosian Walls were the most formidable defensive system of the medieval world, ensuring the survival of Constantinople as the capital of the Byzantine Empire for more than a thousand years. Built in the early 5th century during the reign of Emperor Theodosius II, these massive fortifications stretched across the western land boundary of the city, from the Golden Horn to the Sea of Marmara. Their construction marked a turning point in the history of Constantinople, allowing the rapidly expanding capital to grow beyond its earlier limits while securing it against external threats.

What made these walls exceptional was their sophisticated multi-layered design. Instead of a single barrier, the system consisted of a wide moat, an outer wall, and a much taller inner wall reinforced by towers placed at regular intervals. This defensive arrangement created successive lines of protection, forcing attackers to overcome multiple obstacles under constant exposure to defenders positioned above. The scale and engineering of the Theodosian Walls reflected centuries of accumulated Roman military knowledge, adapted to protect one of the most important cities of Late Antiquity and the medieval world.

For centuries, these fortifications successfully resisted repeated sieges by Persians, Avars, Arabs, Bulgarians, and other powers seeking control of the city. The walls became not only a physical barrier, but also a symbol of Constantinople’s resilience and its role as the last great stronghold of the Roman imperial tradition. Their strength was such that the city remained unconquered from the land for nearly a millennium.

It was only in 1453, with the introduction of large-scale gunpowder artillery, that the defensive balance shifted. The Ottoman army, equipped with powerful cannons, succeeded in breaching sections of the walls, bringing an end to Byzantine Constantinople. Yet even in defeat, the walls endured. Large portions remain standing today, allowing visitors to walk alongside the same fortifications that once defined the limits of one of history’s greatest imperial capitals.

Conclusion

Constantinople was more than a capital — it was the center of a civilization that preserved Roman statecraft, shaped Christian architecture, and influenced the medieval world for over a thousand years. Although the empire itself disappeared, its physical framework still survives in Istanbul. The churches, cisterns, palace ruins, and fortifications in this guide are not isolated monuments, but fragments of a once-unified imperial city.

Walking through these sites today allows you to see how Byzantium was organized, defended, and experienced by those who lived here centuries ago. Some monuments remain monumental, while others survive only in fragments. Yet together, they still reveal the architectural and historical continuity of Constantinople beneath the modern city.

If you wish to explore these places with deeper historical context, you can also join one of my Byzantine walking tours in Istanbul. Whether independently or with guidance, visiting these sites offers one of the clearest ways to understand how Constantinople became one of the most enduring capitals in world history.

Written by Serhat Engul

The post Byzantine Sites (Museums & Ruins) in Istanbul 2026 appeared first on Istanbul Clues.

Romans built a great civilization upon the mathematical, philosophical and medicinal foundations of Ancient Greece and left a great heritage regarding military, administration, architecture and law. In this context, they have built the administrative and legal foundations of contemporary Western Civilization.

Rome was founded as an Italian city-state and it took control of other city-states by following an expansionist policy. Firstly, it established its absolute power over Italy and it began to control the whole Mediterranean region.

In terms of military power, it built a superior military system better than any rival armies and it dominated Europe, Asia and Africa by building military groups named Legionary, who were resilient and disciplined warriors.

Roman Empire Map Over Time

The map of the Roman Empire shows us that the Romans ruled most of the known world in the 2nd century, when they were at their peak. The most important cities of the ancient world were within the borders of the Roman Empire.

Seeing a detailed article about the Roman Empire on an Istanbul blog may be surprising at first glance. However, since Constantinople was once the co-capital of Rome, there is a considerable Roman heritage in Istanbul today.

In this article, you can find a brief history of the Roman Empire under 10 headings. The Roman Empire map and various images will make it easier for me to convey the topics to you.

1. Roman Republic

Rome was a state that was ruled by a republic system for a long time. The Senate that was made up of members from Rome ruled the country by decisions made unanimously for years and they appointed consuls as the head of state when deemed necessary. These consuls would be given absolute power at times of crisis.

The Roman Empire had to face various rebellions, military attacks and invasions in different magnitudes throughout its history. However, it was able to overcome these problems thanks to the crisis management skills of the Senate members.

The Roman Republic existed between 509 and 27 BC. We can list the most important events in the republican period of Rome under a few subheadings.

Hannibal, the Greatest Enemy of Rome

The biggest military threat to Rome came from ancient Carthage, the second superpower after the Roman Empire in the Mediterranean region. Hannibal of Carthage (Carthaginian general) came as close as the center of Italy via Gaul (France) with his army that was reinforced with elephants and he almost conquered Rome thanks to his brilliant strategic moves.

The Romans were defeated by Hannibal repeatedly. However, the Senate could finally make the move that would eliminate him after a few failed attempts and made a counter attack against the Carthaginians.

At this point, we should note that the campaign that Hannibal led wasn’t a simple task. Hannibal’s control over his army, his tactics and victories made him one of the biggest military geniuses in the Ancient Age. He defeated the Roman Empire repeatedly at its home and he occupied the foreign soils for years.

Barbarians, the Arch Enemy of the Empire

The long-term enemy of the Roman Empire were the barbarian tribes in the north. Today’s modern North European nations were seen as Barbarians since they were outside the circle of the Roman civilization.

In the beginning, the barbarians that fought as individual tribes were destroyed by the Roman legions easily. Later, these tribes came together to build a confederation and they became a great threat to the Roman Empire.

Julius Caesar won the first major victories against the barbarian confederation. However, Rome could not find a permanent solution to this problem for centuries. This instability in the West gradually undermined Rome.

Spartacus, The First Big Slave Rebellion

The most famous rebellion in the history of the Roman Empire is the one started and organized by a gladiator named Spartacus. The scope of the unrest was limited in the beginning, but it turned into an organized rebellion that spread fast. However, the Roman Empire could suppress the rebellion in the end.

2. Triumvirate (Rule of Three)

The transition from the Roman Republic to Imperial Rome was so complicated and involved so many plots that it has, and still, inspired a lot of books and movies (e.g. Shakespeare). This period that we’ve emphasized specifically in this article is the Triumvirate (the division of rule among three powerful individuals) and the civil war era that followed it.

When the wars waged in the name of Rome peaked, the Senate appointed three leaders who would lead the military campaigns. These men were already the most influential politicians in Rome, but they were also expected to be excellent commanders.

The First Triumvirate

Pompey, Marcus Crassus and Julius Caesar made up the first triumvirate. Julius Caesar stood out thanks to his intelligence, his orating abilities and influence on the army. Some members of the Senate were afraid he would declare himself as a tyrant. Therefore, they assassinated him in the Senate.

Following the assassination of Julius Caesar, a civil war broke out. Caesar’s adopted son Octavian and his general Marcus Antonius vowed to avenge him. Therefore, Marcus Junius Brutus and Gaius Cassius Longinus had to flee Rome as they were believed to be behind the plot.

Brutus and Longinus planned to gather armies from the Balkan states and recapture Rome. However, they couldn’t match with such great tacticians as Octavian and Antonius, thus ending up defeated.

The Second Triumvirate

The second triumvirate was composed of Octavian, Marcus Antonius and Marcus Lepidus. Antonius and Lepidus used to be the generals of Julius Caesar and Octavian was Caesar’s adopted son.

Octavian defeated his biggest rival Marcus Antonius and his accomplice Cleopatra, the Queen of Ancient Egypt at the Battle of Actium.

After Antony’s defeat, the remaining triumvir Lepidus accepted Octavian’s dominance. Rome had reached a point of no return: the Republic was fading into history, and the era of the Roman Empire was beginning.

3. Roman Empire under Augustus

Octavian declared himself Augustus Caesar in 27 BC. He ruled Rome for years and it continued to be ruled by emperors, most of whom were of military origin, with absolute power until 476 AD.

This could also be interpreted as a misfortune of Julius Caesar. He was a great strategist and we can say he was killed in vain. The same Senate that rooted him out of the Republic and killed him had to accept the hegemony of Octavian by force.

In the period of prosperity that followed Roman emperor Augustus, Rome reached its greatest extent (Pax Romana). Augustus and his successors surrounded the Mediterranean with Roman architecture.

4. Five Good Emperors

Nerva, Trajan, Hadrian, Antoninus Pius and Marcus Aurelius, also known as the Five Good Emperors, brought the Roman Empire to its peak. As can be seen in the map of the Roman Empire below, Rome reached its greatest extent in 117.

This period is also known as the “Adoptive Emperors” era, and each emperor adopted and trained his successor during his reign. However, this well-working system came to an end when Emperor Marcus Aurelius wanted to enthrone his own son Commodus.

Commodus didn’t have the skill to rule Rome. However, Aurelius didn’t see it maybe because Commodus was his son. The dark period when Commodus was the emperor is narrated nicely in the movie Gladiator.

5. Roman Empire Map At Its Height

When the Roman Empire reached the height of its power, it had completely taken control of the Mediterranean. The map of the Roman Empire at its height shows us that the most productive ports were under Roman control.

Rome was at its peak during the Nerva–Antonine dynasty (aka Five Good Emperors). Rome continued to maintain its power during the Severan dynasty. However, with the death of Severus Alexander in 235, a 50-year period of crisis began.

6. The Roman Tetrarchy

After the Five Good Emperors era, the throne kept switching hands by military coups repeatedly. After a period of chaos during the 200’s, the first reform act was carried out by an emperor named Diocletian. He regulated the unstable political life in Rome and established The Roman Tetrarchy (Rule of Four).

This system included two senior emperors (Augustus) in the East and the West and their juniors and designated successors (Caesar). Tetrarchy facilitated the rule of the empire for a while, but on the other hand, it paved the way for new civil wars.

Diocletian was the first emperor to consider moving the center of the empire to the East. He built a palace in Nicomedia and lived there during his 20-year reign. When he abdicated voluntarily, he withdrew to his new palace in Croatia.

In the Roman Tetrarchy system, Maximian in the West and Diocletian in the East were senior emperors. Constantius (father of Constantine the Great) in the West and Galerius in the East were junior emperors.

7. Constantine the Great

Emperor Constantine was a caesar (junior emperor) in the Tetrarchy. However, with his success on the battlefields, he eventually became the sole ruler of the Roman Empire. Constantine the Great was the first to consolidate power in decades, and this power allowed him to make major reforms.

Emperor Constantine and Christianity

One of the first things Emperor Constantine did was legitimize Christianity with the Edict of Milan in 313. The oppressive policies, which had reached its peak during the reign of his predecessor Diocletian, thus came to an end.

He also gathered the First Council of Nicaea (the first ecumenical council of the Christian church) and ensured that Christianity had an official structure. Thus Rome, Constantinople, Antioch, Jerusalem and Alexandria became episcopal centers.

The New Capital: Constantinople

Constantine permanently moved the center of Rome to the East. He declared Byzantium (Istanbul) the capital and built its first monumental buildings. These include the Forum of Constantine, the main square of the city, the Great Palace where emperors lived and the Hippodrome where chariot races were organized.

Emperor Constantine lived in Constantinople after he established peace in the Roman Empire and when he died, he was buried in the Church of the Holy Apostles. In this church there were 12 sarcophagi dedicated to the apostles, some of which had real relics.

8. The Division of the Roman Empire

Emperor Constantine put an end to the civil war period that lasted for a long time. However, his sons fought for the throne after his death. The badly ruled empire found itself in chaos again.

Emperor Valens, known for building the Aqueduct of Valens in Istanbul, died on the battleground fighting the Goths. The empire was left without a leader and went into a deep crisis. When things were going wrong, Theodosius saved the empire and put things in order.

Theodosius became the emperor who completed the Christianization in the Roman Empire. Also, the Obelisk of Theodosius in Istanbul was dedicated to him. Following his death, the Roman Empire was divided into two and the Eastern Roman Empire, known also as the Byzantine Empire, was born.

The Division of the Roman Empire took place in 395, after Theodosius’ death. Arcadius became the Emperor of the Eastern Roman Empire and its capital was Constantinople. Honorius, on the other hand, became the Emperor of the Western Roman Empire and its capital was Rome. On the Roman Empire map above, you can see Rome divided into two.

9. Fall of the Western Roman Empire

The fall of the Western Roman Empire took place in 476. When Rome was divided in 395, the Eastern Roman Empire had just begun its run that would last until 1453. However, the Western Roman Empire survived only 81 years as a result of barbarian attacks.

In the West, the Roman Catholic Church filled the lack of political authority after the fall of the Western Roman Empire. The Vatican was built in the heart of Rome and St. Peter’s Basilica where Popes resided and it became a center of power that ruled the kingdoms in Europe during the Middle Age.

On the Roman Empire map above, you can see how Europe was divided after the fall of Western Rome.

10. Byzantine Empire

The Byzantine Empire, the legal heir to the Roman Empire, lived another 1000 years. Famous emperors such as Justinian worked to restore the glory of Rome. Thanks to Emperor Justinian, Roman rule spread again throughout the Mediterranean in the 6th century.

On the Eastern Roman Empire Map above, you can see the conquests during the reign of Justinian I. Seeing himself as a Roman emperor, Justinian recaptured the eternal capital Rome from the Goths. However, the resources of Byzantium were not enough to protect these borders for long.

As a footnote, I would like to add that when I last updated this article in 2025, I added drawings produced by DALLE, ChatGPT’s AI visual generator. When I gave DALLE as detailed explanations as possible, I was able to get results that would bring a history article to life.

Conclusion

It might be surprising to see such a passionate post about the Roman Empire on a blog about Istanbul. However, since Istanbul was declared the co-capital of Rome under the name of Constantinople after 330, this subject arouses my curiosity.

The Roman Empire left a great legacy to the world in the political, architectural and legal fields. Reaching incredible borders during the imperial period, Rome finally split into east and west in 395.

As a tour guide in Istanbul, I see that my Western guests’ knowledge of the Roman Empire ended in 476. It should be emphasized, however, that after the collapse of Western Rome, the Roman legacy continued to live on in Eastern Rome (aka Byzantium).

The city where this culture lived was Constantinople, and the legal heirs of the Roman Empire were the Byzantine emperors. In fact, Rome had significant effects even in the Ottoman Empire after Byzantium.

Written by Serhat Engul

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