William I Sanudo was the fourth Duke of the Archipelago from 1303 to his death. He was the son and successor of Marco II

Marco II Sanudo

Marco II Sanudo was the third Duke of the Archipelago from 1262 to his death.-Family:Marco was the eldest son and successor of Angelo Sanudo. According to "The Latins in the Levant. A History of Frankish Greece " by William Miller, his mother was "a French dame of high degree", daughter of...

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William's father succeeded in reacquiring some territories he had lost shortly before he left the intact duchy to his son. William's son and successor, Nicholas

Nicholas I Sanudo

Nicholas I Sanudo was the fifth Duke of the Archipelago from 1323 to his death. He was the son and successor of William I....

, was one of the few knights to escape from the Battle of Halmyros

Battle of Halmyros

The Battle of Halmyros, of Orchomenos, or of the Cephissus was fought on 15 March 1311 between the Frankish Greek forces of Walter V of Brienne and the mercenaries of the Catalan Company, resulting in a devastating victory for the Catalans....

 in 1311. His other sons were John I

John I Sanudo

John I Sanudo was the sixth Duke of the Archipelago from 1341 to his death.He was the brother and successor of Nicholas I and son of William I. His other brother was Marco Sanudo, Lord of Milos....

 and Marco Sanudo, Lord of Milos

Marco Sanudo, Lord of Milos

Marco Sanudo was a Lord of Milos.He was a son of William I Sanudo and the brother of Nicholas I Sanudo and John I Sanudo, who were all Dukes of the Archipelago....

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Sources

• Setton, Kenneth M.
  Kenneth Setton
  Kenneth Meyer Setton was an American historian and an expert on the history of medieval Europe.- Early life, education and awards :...
  
  (general editor) A History of the Crusades: Volume II — The Later Crusades, 1189 – 1311. Robert Lee Wolff and Harry W. Hazard, editors. University of Wisconsin Press: Milwaukee, 1969.
• Setton, Kenneth M. (general editor) A History of the Crusades: Volume III — The Fourteenth and Fifteenth Centuries. Harry W. Hazard, editor. University of Wisconsin Press: Madison, 1975.