[son of William III of Poitou (V of Aquitaine) "le Grand" Count of Poitou Duke of Aquitaine [96-41, 135-38, 178-40, 286-39, 296-40, 361-40, 506-39] and Agnes of Burgundy [96-41, 135-38, 178-40, 286-39, 296-40, 361-40, 449-39, 506-39]] [See 361-39 above]