Hagia Sophia (; from the Greek Αγία Σοφία, pronounced [aˈʝia soˈfia], "Holy Wisdom "; Latin : Sancta Sophia or Sancta Sapientia; Turkish: Ayasofya) a structure built under order of Justinian, and later turned into a mosque, when it was captured by the Ottoman imperial in 29 May 1453. The structure is now a museum (Ayasofya Müzesi) in Istanbul, Turkey. From the date of its construction in 537 AD until 1453, it served as an Eastern Orthodox cathedral and the seat of the Patriarch of Constantinople, except between 1204 and 1261, when it was converted by the Fourth Crusaders to a Roman Catholic cathedral under the Latin Empire. The building was later converted into an Ottoman mosque from 29 May 1453 until 1931. It was then secularized and opened as a museum on 1 February 1935. Famous in particular for its massive dome, it is considered the epitome of Byzantine architecture and is said to have "changed the history of architecture ". It remained the world 's largest cathedral for nearly a thousand years, until Seville Cathedral was completed in 1520.
The current building was originally constructed as a church between 532 and 537 on the orders of the Byzantine Emperor Justinian I and was the third Church of the Holy Wisdom to occupy the site, the prior one having been destroyed by rioters in the Nika Revolt. It was designed by the Greek geometers Isidore of Miletus and Anthemius of Tralles. The church was dedicated to the Wisdom of God, the Logos, the second person of the Trinity, its patronal feast taking place on 25 December, the commemoration of the birth of the incarnation of the Logos in Christ.
