In 1344, the Ottoman Turks occupied part of Naxos, enslaving 6,000 locals. John was a supporter of Venice in her war against Genoa, but he was captured and taken captive to Genoa in 1354. He was let go in by the terms of the peace treaty of 1355.
With his wife Maria he had one daughter, Florence, who succeeded him.
^Mihail-Dimitri Sturdza, Dictionnaire Historique et Généalogique des Grandes Familles de Grèce, d'Albanie et de Constantinople, Paris: Sturdza, 1983, p. 549