Hagia Sophia (from the Greek 'Holy Wisdom'; Latin: Sancta Sophia or Sancta Sapientia; Turkish: Aya Sofya) is a former Orthodox patriarchal basilica; later a mosque; and now a museum in Istanbul; Turkey. From the date of its dedication in 360 until 1453; it served as the cathedral of Constantinople; except between 1204 and 1261; when it was converted to a Roman Catholic cathedral under the Latin Patriarch of Constantinople of the Western Crusader established Latin Empire. The building was a mosque from 29 May 1453 until 1934; when it was secularized. It was opened as a museum on 1 February 1935.