 In 1302, Zaccaria was named admiral by Philip of France, in which capacity he conquered the island of Chios (1304), which had thitherto been in the hands of Moslem corsairs.At first, he gave the government of the isle over to his nephew Tedisio.In 1304, he also occupied Samos and Cos, which were almost completely depopulated, and the emperor conceded him sovereignty over those islands and Chios for two years, under Byzantine suzerainty.