Hagia Sophia mosque (lit. 'the Holy Wisdom'; Ancient Greek: Ἁγία Σοφία, romanized: Hagía Sophía; Turkish: Ayasofya) in İznik (Nicaea) in Bursa Province, Turkey, was built as a Byzantine-era basilican church. Converted into the Orhan Mosque (Turkish: Orhan Camii) after the Ottoman conquest, it was turned into a museum in 1935. The church is now once again in service as a mosque. It is in the town centre of İznik, within the old walled area.
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