The Church of Hagia Sophia was located in less than 2 km west of Trebizond (modern Trabzon). It was likely founded by the Emperor of Trebizond Manuel I Komnenos (1238-1263). It has a cross-in-square plan with columns supporting the dome, the east bays of the aisles barrel-vaulted and the longer west bays cross-vaulted. Its narthex is an unusual feature in Trebizond and for the three great porches it is hard to find a parallel anywhere; though there are Georgian and Armenian churches with large porches. It is extensively decorated with frescoes. TIt was converted into a mosque in 1573.