William IV of Aquitaine937-February 5 995), nicknamed Iron Arm, was Duke of Aquitaine and Count of Poitiers between 963 and 995. William was the son of William III of Aquitaine and Adele of Normandy. He was brother in law of Hugh I of France, married to his sister Adelaide. William married Emma of Blois.
See also: Dukes of Aquitaine family tree
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William III of Aquitaine
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William V of Aquitaine