Guillaume X "le Jeune" Duc de Aquitaine y VIII Comte d' Poitou
- Born: 1099, St. Jacques Compostelle, France
- Marriage: Aliénor de Châtellerault
- Died: 19 Apr 1137, Galicia, Spain at age 38
 Other names for Guillaume were Willam X "the Saint" Duke of Aquitaine and William Duke of Aquitaine VIII Count of Poitou.
Noted events in his life and other information:
• Death :
Died while on his way to pilgrimage in the Holy Land.
Guillaume married Aliénor de Châtellerault, daughter of Aumary I Vicomte de Châtellerault and Dangereuse de L'Isle Bouchard. (Aliénor de Châtellerault was born in 1103 in Châtellerault, Poitou, Aquitaine and died in Mar 1130-1137 in Talmont, France.)
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