A Monument That Spans Civilisations

Few buildings in the world carry as much history within their walls as the Hagia Sophia (Ayasofya in Turkish). Standing at the heart of Istanbul's historic peninsula, it has served as a cathedral, a mosque, a museum, and a mosque once more. Its nearly 1,500-year lifespan makes it one of the most extraordinary architectural survivors on Earth.

The Byzantine Cathedral (537–1453)

The Hagia Sophia as we know it today was commissioned by the Byzantine Emperor Justinian I and completed in 537 CE — though two earlier churches had occupied the same site before it. The architects Anthemius of Tralles and Isidore of Miletus created something that astonished the ancient world: a vast central dome seemingly floating above the nave, supported by a ring of windows that flood the interior with light.

For nearly a thousand years, it served as the cathedral of the Ecumenical Patriarchate of Constantinople, the spiritual heart of Eastern Christianity. Its mosaics, many of which still survive today, depicted Christ, the Virgin Mary, and the emperors and empresses of Byzantium.

The Great Dome

The dome measures approximately 31 metres in diameter and rises 55 metres above the floor. In its day — and arguably still — it was an engineering marvel. The original dome partially collapsed in 558 CE and was rebuilt with a slightly steeper profile that has endured ever since.

The Ottoman Mosque (1453–1934)

When Sultan Mehmed II conquered Constantinople on 29 May 1453, one of his first acts was to convert the Hagia Sophia into a mosque. He reportedly prayed there the very next day. The conversion brought significant changes:

  • Four minarets were added over subsequent centuries
  • Christian icons and mosaics were plastered over (a decision that inadvertently preserved them)
  • Islamic calligraphic roundels bearing the names of Allah, Muhammad, and the early caliphs were installed
  • A mihrab (prayer niche) and minbar (pulpit) were added, oriented toward Mecca

The building served as Istanbul's premier imperial mosque for nearly five centuries.

The Museum Years (1934–2020)

In 1934, as part of Mustafa Kemal Atatürk's secularising reforms of the Turkish Republic, the Hagia Sophia was converted into a museum — open to visitors of all backgrounds and none. This status allowed for the careful uncovering and restoration of Byzantine mosaics, and the building became one of Turkey's most-visited attractions. It was designated a UNESCO World Heritage Site as part of the Historic Areas of Istanbul in 1985.

Return to a Mosque (2020–Present)

In July 2020, a Turkish court ruling and subsequent presidential decree reconverted the Hagia Sophia into a functioning mosque. The decision drew international attention and debate. Today, the building holds regular prayers and is open to visitors outside prayer times, though certain areas and mosaics may be covered or restricted during worship.

What to See Inside

  • The Deësis Mosaic: A stunning 13th-century Byzantine mosaic in the upper gallery, considered one of the finest examples of Byzantine art
  • The Empress Zoe Mosaic: Depicting Christ flanked by Emperor Constantine IX and Empress Zoe
  • The Weeping Column: A pillar in the nave said to have miraculous properties; visitors traditionally insert a finger into its copper-covered hollow
  • The Ottoman Calligraphic Roundels: Eight enormous medallions, each nearly eight metres in diameter
  • The Upper Galleries: Offering elevated views of the dome and nave, and housing the most intact mosaics

Visiting Hagia Sophia Today

The Hagia Sophia is located in Sultanahmet, a short walk from the Blue Mosque and Topkapı Palace. Entry is free, though a ticket may be required at peak times. Visitors should dress modestly — shoulders and knees covered — and women should carry a headscarf. Remove shoes before entering the prayer areas. Arrive early in the morning for smaller crowds and better light through the dome windows.

Whatever your personal or spiritual perspective, standing beneath that ancient dome is an experience that connects you — viscerally — to more than a millennium of human history.