Lake Basilica in Nicaea
The remains of a Late Antique basilica were discovered in 2014 in the lake about 20 meters from the shore of modern İznik (ancient Nicaea). It had a narthex and an atrium and was flanked by two rooms, one of which contains a sarcophagus. The basilica, which is surrounded by graves, has tentatively been identified with achurch for St. Neophytus of Nicaea. It was possibly destroyed either in the earthquake of 740 or 1065.
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Oxford Dictionary of Byzantium edited by Alexander Kazhdan