Hamo was steward to both King William I and his son King William II. He was acting as royal steward by 1069. Hamo was appointed to the office of
Sheriff of Kent in 1077 and held it until his death. The historian Emma Mason suggests that Hamo, along with
Ranulf Flambard,
Urse d'Abetot,
Robert FitzHamon (Hamo's son), Roger Bigod and Eudo Dapifer, were the first recognisable
Barons of the Exchequer under William II. These men were often associated together as royal officials in government and jointly witnessed documents. Hamo witnessed six
writs of William II. Hamo's involvement in the higher levels of government dates especially from King William II's absence from England in the late 1090s. In 1099, when William II was in Normandy, Hamo was one of the main assistants to Flambard, who had been left as regent of England in the king's absence. Hamo was still witnessing royal documents in September 1099, and was one of the witnesses to the letter which King
Henry I (1100–1135), William II's brother and successor, wrote to
Anselm,
Archbishop of Canterbury, shortly after his accession. Hamo died shortly after witnessing these documents. ==Family==