William IX of Aquitaine
Duke of Aquitaine and Gascony and Count of Poitou
- Lived
- 1071–1126
- Country
- Duchy of Aquitaine
Updated September 2026
About William IX of Aquitaine
William IX was the Duke of Aquitaine and Gascony and Count of Poitou between 1086 and his death. He was also one of the leaders of the Crusade of 1101.
Biography from Wikipedia, CC BY-SA 4.0. Photo via Wikimedia Commons.
Sources: book lists and dates from Wikidata and Open Library, ratings from Open Library readers. Last updated September 2026.