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William X
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William X

duke of Aquitaine
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Quick Facts
Born:
1099, Toulouse, Fr.
Died:
April 9, 1137, Santiago de Compostela, Spain (aged 38)
Notable Family Members:
daughter Eleanor of Aquitaine
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William X (born 1099, Toulouse, Fr.—died April 9, 1137, Santiago de Compostela, Spain) was the duke of Aquitaine and of Gascony (1127–37), son of William IX.

In 1131 he recognized the antipope Anaclet and supported him until 1134. In 1136 he ravaged Normandy. The following year he went on a pilgrimage to Santiago de Compostela in Galicia, where he died. His daughter, Eleanor of Aquitaine, inherited all his lands and, first, through her marriage to Louis VII of France, united Aquitaine with the Capetian line and, then, through her marriage to Duke Henry of Normandy (the future Henry II of England) united Aquitaine to the Plantagenet line.

This article was most recently revised and updated by Encyclopaedia Britannica.