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William IV, Duke of Aquitaine
Duke of Aquitaine and Count of Poitou
Years: 937 - 994
William IV (937 – 3 February 994), called Fierebras or Fierebrace (meaning "Proud Arm", from the French Fier-à-bras or Fièrebrace, in turn from the Latin Ferox brachium), is the Duke of Aquitaine and Count of Poitou from 963 to his retirement in 990.
