[1] More recent research has established that Guy was in fact Otto's son, leaving William's identity open to question.
[2] Whatever his origin, William by 1256 became the lord of the Barony of Veligosti (Miser Guglielmo de Villegorde in Marino Sanudo's history) in the Principality of Achaea.
[5] In 1257–58 he became involved in the War of the Euboeote Succession, siding with the Lombard triarchs of Euboea and the Republic of Venice against his suzerain, Prince William II of Villehardouin.
As he was likely to lose his domain as a result of this act of rebellion, he was promised by the Venetians territory in the value of 1,000 hyperpyra in compensation.
In the event, despite William II's victory in the war, he was pardoned and allowed to retain his barony in the peace treaty of 1262.