17. HYDRUNTIS or IDRUNTIS EPISCOPUS, (ἐπίσκοπος Ἱδροῦντος), BISHOP of OTRANTO. Marcus of Otranto is supposed to have lived in the eighth century. Allatius says he was oeconomus or steward of the great church of Constantinople, before he became bishop, which seems to be all that is known of him.
A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890