Duke Guillaume VIII D'AQUITAINE comte de Poitiers
- Born: 22 Oct 1026, Poitiers, Vienne, France
- Marriage (1): Hildegarde DE BOURGOGNE Duchess of Gascony and Aquitaine in Sep 1069 in Gironde-sur-Dropt, Gironde, France
- Died: 25 Sep 1086, Chizé, Deux-Sèvres, France at age 59
 General Notes:
William VIII (c.?1025-25 September 1086), born Guy-Geoffrey (Gui-Geoffroi), was duke of Gascony (1052-1086), and then duke of Aquitaine and count of Poitiers (as William VI) between 1058 and 1086, succeeding his brother William VII (Pierre-Guillaume).
Guy-Geoffroy was the youngest son of William V of Aquitaine by his third wife Agnes of Burgundy. He was the brother-in-law of Henry III, Holy Roman Emperor who had married his sister, Agnes de Poitou.
He became Duke of Gascony in 1052 during his older brother William VII's rule. Gascony had come to Aquitanian rule through William V's marriage to Prisca (a.k.a. Brisce) of Gascony, the sister of Duke Sans VI Guilhem of Gascony.
Guillaume married Hildegarde DE BOURGOGNE Duchess of Gascony and Aquitaine in Sep 1069 in Gironde-sur-Dropt, Gironde, France. (Hildegarde DE BOURGOGNE Duchess of Gascony and Aquitaine was born about 1056 in Dijon, Côte-d'Or, France and died on 9 Sep 1104 in Lot-et-Garonne, France.)
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