 He obtained from FitzHamon the lordship of Neath, Glamorgan, in which he built Neath Castle and in 1129 founded Neath Abbey.Richard de Grenville was one of three (or four) known sons of Hamo Dapifer (died "circa" 1100) Sheriff of Kent, an Anglo-Norman royal official under both King William the Conqueror (1066–1087) and his son King William Rufus (1087–1100).He is by tradition the founder and ancestor of the prominent Westcountry Grenville family of Stowe in the parish of Kilkhampton in Cornwall and of Bideford in Devon.