William IV of Aquitaine (937 – February 5 995), nicknamed Fierebras (Iron Arm), was Duke of Aquitaine and Count of Poitiers between 963 and 995.
William was the son of William III of Aquitaine and Gerloc (Adele) of Normandy. He was brother in law of Hugh I of France, married to his sister Adelaide. William married Emma of Blois . Their marriage was stormy, in part because of William's indulgence in the pursuit of women and wild animals. She banished his paramours, they separated twice for long periods, and finally he retired to a monastery, leaving Emma to rule Aquitaine in the name of their son until 1004.
Sources
Owen, D.D.R. Eleanor of Aquitaine, Queen and Legend, 1993
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