Background
William was the third son of William V of Aquitaine, the eldest by his third wife, Agnes of Burgundy.
William was the third son of William V of Aquitaine, the eldest by his third wife, Agnes of Burgundy.
His mother remarried to Geoffrey Martel, Count of Anjou, during his reign. Geoffrey Martel refused to concede to him the territories gained in the reigns of his predecessors. William set to work regaining his patrimony by force of arms.
He was besieging Geoffrey in Saumur when he died of dysentery.
Two daughters have been hypothesized to be children of this couple:
Clementia, who married Conrad I of Luxembourg
Agnes, who married Peter I of Savoy.