 He died in 996 or 997 and was succeeded by his son, Bernard William.Around 970, William was using only the title of count as when "Lord William Sánchez, count of the Gascons" donated land in the village of "Luco Deo" to the monastery of Saint Vincent-de-Lucq.He inherited the county of Bordeaux from his cousin William the Good, son of his aunt Entregodis, who married one Raymond, and united it to Gascony permanently.