Hagia Sophia

Hagia Sophia in Istanbul is one of the most significant architectural and religious monuments in the world, serving successively as an Eastern Orthodox cathedral, a Roman Catholic cathedral, a mosque, a museum, and since 2020 once again a mosque. [1][3]

The current structure was built by Emperor Justinian I between 532 and 537 CE, replacing two earlier churches on the same site. It served as the principal cathedral of the Eastern Orthodox Church for nearly a thousand years until the Ottoman conquest of Constantinople in 1453, when Sultan Mehmed II converted it into a mosque. In 1934, Mustafa Kemal Ataturk secularized it as a museum, and in 2020 it was reconverted to a mosque. [1][2]

Hagia Sophia's massive dome was an engineering marvel that influenced both Byzantine and Ottoman architecture for centuries. It contains significant Byzantine mosaics (some now covered during prayer times) and Ottoman calligraphic panels. The building symbolizes the complex religious history of Istanbul and the broader region. [1][2]

Hagia Sophia is a UNESCO World Heritage Site as part of the Historic Areas of Istanbul. It is open to visitors outside of prayer times, with modest dress required. [3][1]

Reconverted to a mosque in 2020, Hagia Sophia again hosts Muslim prayer while remaining open to visitors outside prayer times, who are asked to dress modestly. For much of the twentieth century it served as a museum, a status that reflected its layered religious history. [1][3]

The building is dominated by its vast central dome, a sixth-century engineering achievement that seems to float above the nave on a ring of windows. Byzantine gold-ground mosaics and monumental Ottoman calligraphic roundels share the interior, with some mosaics screened during prayer. [1][2]

Built by Justinian I and completed in 537 CE, Hagia Sophia was the principal cathedral of Eastern Orthodoxy for nearly a thousand years before becoming a mosque after the Ottoman conquest of Constantinople in 1453. Its dome shaped both Byzantine and Ottoman architecture and made the building a symbol of the city's contested religious history. [1][2]