Person

William VIII, Duke of Aquitaine

c. 1025–1086 · 11th century · Also known as Guy-Geoffrey

William VIII, born Guy-Geoffrey, was Duke of Aquitaine and Count of Poitou from 1058 to 1086. A son of William V the Great, he secured the Duchy of Gascony in the 1050s and 1060s, uniting it with Aquitaine and extending ducal lordship from the Loire to the Pyrenees. He took part in the Barbastro expedition of 1064 and founded the abbey of Montierneuf at Poitiers.

William VIII, Duke of Aquitaine
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Mentioned in 1 profile

Duchy of AquitaineFoundation

Mentioned in 1 state history

Duchy of Gascony

See also

Cite this entry
APA
The Epoch Institute. (2026). William VIII, Duke of Aquitaine. In The Epoch Institute Encyclopedia. https://the-epoch-institute.org/encyclopedia/william-viii-duke-of-aquitaine
MLA
“William VIII, Duke of Aquitaine.” The Epoch Institute Encyclopedia, The Epoch Institute, 2026, https://the-epoch-institute.org/encyclopedia/william-viii-duke-of-aquitaine. Accessed .
Chicago
The Epoch Institute. “William VIII, Duke of Aquitaine.” The Epoch Institute Encyclopedia. 2026. https://the-epoch-institute.org/encyclopedia/william-viii-duke-of-aquitaine.
Harvard
The Epoch Institute (2026) ‘William VIII, Duke of Aquitaine’, The Epoch Institute Encyclopedia. Available at: https://the-epoch-institute.org/encyclopedia/william-viii-duke-of-aquitaine (Accessed: ).

Last reviewed October 2026Random entry ↻