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William X, Duke of Aquitaine
Duke of Aquitaine, Duke of Gascony, and Count of Poitou (as William VIII)
Years: 1099 - 1137
William X (1099 – 9 April 1137), called the Saint, is Duke of Aquitaine, Duke of Gascony, and Count of Poitou (as William VIII) between 1126 and 1137.
He is the son of William IX by his second wife, Philippa of Toulouse.
