released them from their allegiance to the couple in 1306. Isabella died in exile in 1311. William's younger daughter by Anna–Agnes, Margaret, received the two-thirds of the Barony of Akova from his father in 1276. She married Isnard of Sabran first. Her second marriage was to Richard I Orsini, Count palatine of Cephalonia and Zakynthos, in 1299. In 1311, she claimed William had bequeathed Achaea to her in a secret will on his deathbed. Her claim gave rise to civil war between the supporters of her niece Matilda of Hainaut and her son-in-law Ferdinand of Majorca after she died in 1315. Notes References Sources Further reading Villehardouin family Princes of Achaea Christians of the Sixth Crusade French poets Trouvères Politicians from Kalamata Prisoners of war held by the Byzantine Empire French male poets Male classical composers 1211 births 1278 deaths 13th-century people of the Principality of Achaea