Willelm de Abrincis, son and heir of Rivallon d'Avranches, lord of Folkestone, Kent, whom he succeeded by 1134. Occurs in a Norman inquest of 1172 as tenant of one fee of Mortain. He died c 1177 leaving a son Simon, who came of age c 1190 and died in 1203, leaving a son William II (d 1230). In 1242 his heir was his granddaughter Matilda, wife of Hamo II de Crevquer (d 1263). [Domesday Descendants p263]
Sources:
1. Title: Domesday Descendants, A Prosopography of People Occurring in English Documents 1066-1166, K B S Keats-Rohan {2002}
Repository:
Media: Book
Page: 263
2. Title: The Origins of Some Anglo-Norman Families, Lewis C Loyd, 1999
Repository:
Media: Book
Page: 9-10
3. Title: English Baronies, A Study of Their Origin and Descent 1086-1327, Sanders {1960}
Repository:
Media: Book
Page: 45-46