William FitzOsbern was a prominent Norman nobleman and military leader during the 11th century. He played a significant role in the Norman Conquest of England in 1066, serving as a close companion to William the Conqueror. FitzOsbern was rewarded for his loyalty with vast lands and titles, becoming the first Earl of Hereford. As a military commander, FitzOsbern led several campaigns to secure and expand Norman control in England. He was instrumental in the establishment of Norman rule and helped build key fortifications, including Hereford Castle. His contributions significantly shaped the political landscape of post-conquest England.