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Hagia Sophia
Built 537; mosque 1453; museum 1934; mosque 2020· Holy place· Judaism, Christianity & Islam
Historical recordConfirmed by archaeology, outside sources or contemporary records.
The great domed church of Constantinople (Istanbul), built in 537, later a mosque, then a museum, and a mosque again.
See it on the World Religions map →What it is
Emperor Justinian rebuilt it in under six years after riots burned an earlier church; it was dedicated in 537. Its dome, about 31 meters (100 feet) across, seems to float on a ring of windows. For over 900 years it was the cathedral of the patriarch of Constantinople. After the Ottoman conquest in 1453, Sultan Mehmed II made it a mosque and minarets were added. Turkey made it a museum in 1934; in 2020 a court annulled that decree and it reopened as a mosque.
Why it matters
For Orthodox Christians it remains the great symbol of Byzantine Christianity; its changing status mirrors shifts between Christianity, Islam and secular Turkey.
Think of it like
Like a trophy building repositioned by each new owner: cathedral, mosque, museum, mosque, yet the same structure throughout.
Sources and history
The building itself, still standing; the historian Procopius's eyewitness account of its construction; Byzantine and Ottoman records; Turkey's 1934 cabinet decree and the 2020 Council of State ruling.
Questions and debates
Engineers still study how the dome survives earthquakes after collapses in 558, 989 and 1346. The 2020 reconversion drew protests from Greece, UNESCO and Orthodox churches.
Connections (2)
▸Hagia Sophia was the great church of Eastern Orthodox ChurchHistorical record
The connection
For over 900 years Hagia Sophia was the cathedral of the patriarch of Constantinople and the stage for imperial coronations and the grandest Orthodox liturgy. A Russian chronicle says envoys of Prince Vladimir of Kyiv, attending a service there around 987, 'knew not whether we were in heaven or on earth', helping persuade him to adopt Orthodoxy.
When and where
Constantinople, from its dedication in 537 to the Ottoman conquest of May 29, 1453, except for Latin Catholic control after the crusader sack, 1204–1261.
Historical evidence
Byzantine liturgical and court records; the Russian Primary Chronicle (c. 1113); Christian mosaics of Christ, Mary and emperors still visible inside.
Questions and debates
The envoy story may be a later legend. Since 2020, how the Christian mosaics are covered during Muslim prayer has become a point of contention.
▸Hagia Sophia became a mosque again amid Islamic revival and political IslamMostly agreed by scholars
The connection
Atatürk's secular republic made the former church and mosque a museum in 1934. Turkish Islamist and nationalist groups campaigned for decades to restore it as a mosque. In July 2020 a top court annulled the 1934 decree, and President Erdoğan, whose AKP grew out of Turkey's Islamist movement, reopened it for Friday prayers.
When and where
Istanbul, July 10, 2020 court ruling and decree; first Friday prayers July 24, 2020; President Recep Tayyip Erdoğan and Turkey's religious affairs directorate.
How do we know?
The court ruling and presidential decree are public, as are protests from UNESCO, Greece, the World Council of Churches and Orthodox leaders.
Questions and debates
How much the move reflected religious conviction versus domestic nationalist politics is debated; Erdoğan framed it as national sovereignty and the legacy of the 1453 conquest.