William de Hever is believed to be the first owner of Hever Castle. William was a descendant of a Norman baron who came to England during the Conquest and became Sheriff of Kent in 1272, the first year of Edward I’s reign. When William died the manor of Hever was divided between his two daughters, Margaret and Joan. The sisters were married to brothers William and Reginald Cobham. It has been suggested that Joan purchased her sister’s half of the manor thus bringing all Hever into her ownership and that of the Cobham family.