Tags: Noble.
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) was the Duke of Aquitaine and Count of Poitou from 963 to his retirement in 990.William’s father William III abdicated to the abbey of Saint-Cyprien in Poitiers and left the government to Fierebras. His mother was Gerloc the daughter of Duke Rollo of Normandy.