William VIII, Duke of Aquitaine explained

William VIII
Succession:Duke of Gascony
Reign:1052–1086
Predecessor:Bernard II Tumapaler
Successor:William IX, Duke of Aquitaine
Birth Name:Gui-Geoffroi
Birth Date:c. 1025
Birth Place:Poitiers
Death Date:25 September 1086
Death Place:Chizé
Spouse:Garsende of Périgord
Matoeda
Hildegarde of Burgundy
Issue:Agnes of Aquitaine, Queen of León and Castile
Agnes of Aquitaine, Queen of Aragon and Navarre
William IX, Duke of Aquitaine
House:Ramnulfids
Father:William V, Duke of Aquitaine
Mother:Agnes of Burgundy
Succession1:Duke of Aquitaine
Reign1:1058–1086
Predecessor1:William VII, Duke of Aquitaine
Successor1:William IX, Duke of Aquitaine

William VIII (– 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).

Life

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.

William VIII was one of the leaders of the allied army called to help Ramiro I of Aragon in the Siege of Barbastro (1064). This expedition was the first campaign organized by the papacy, namely Pope Alexander II, against a Muslim town and stronghold in the Emirate of Zaragoza, and the precursor of the later Crusades movement. Aragon and its allies conquered the city, killed and enslaved its inhabitants and collected an important booty.

However, Aragon lost the city again in the following years. During William VIII's rule, the alliance with the southern kingdoms of modern Spain was a political priority as shown by the marriage of all his daughters to Iberian kings.

Marriage and children

William married three times and had at least five children. After he divorced his first two wives, the first due to infertility, he married a third time to a much younger woman who was also his cousin Robert I of Burgundy's daughter. This marriage produced a son, but William VIII had to visit Rome in the early 1070s to persuade the pope to recognize his children from his third marriage as legitimate.

  1. Agnes, married Alfonso VI of Castile
  1. Agnes (died 1097), married Peter I of Aragon
  2. William IX of Aquitaine, his heir

Sources

See also

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