John I Sanudo

John I Sanudo, called Janulli (died 1362), a son of William I, succeeded his brother Nicholas I in 1341 as sixth duke of the Archipelago. In 1344 the Aydınid Turks occupied part of Naxos and carried off some six thousand islanders as slaves.

Backing Venice in her war with Genoa, he was captured and imprisoned at Genoa, and held there despite papal pleas until the peace settlement of 1355. By his wife Maria he left a daughter, Florence, who followed him as duchess of the Archipelago.