William was Duke of Aquitaine and Count of Poitou and Avergne. Dr. Erick Brandenburg, "Die Nachkommen Karls des Grossen" (1935), p. 66 is cited by a correspondent as source of birth-year 925 for William and death date 04-03-963, and for approximate death date for his wife, "Gerloc (Adele)", 10-14-962. "Ancestral Roots..." (Balt., 1992) 110-23 states that William II is son of William I of Poitou.

References: [ES],[WallopFH],[RFC],[Paget1]