William IV, Duke of Aquitaine

William IV
Duke of Aquitaine and Count of Poitou
Reign963–990
PredecessorWilliam III, Duke of Aquitaine
SuccessorWilliam V, Duke of Aquitaine
Bornc. 937
Poitiers
Died3 February 994
Burial
SpouseEmma of Blois
IssueWilliam V, Duke of Aquitaine
Ebles
HouseRamnulfids
FatherWilliam III, Duke of Aquitaine
MotherGerloc of Normandy

William IV (c. 937 – 3 February 994), called Fierebras (meaning "Proud Arm", from the French Fier-à-bras (which means Proud-to-Arm), in turn from the Latin Ferox brachium) (which means A Fierce Arm), was the Duke of Aquitaine and Count of Poitou from 963 to his retirement in 990.