William de Crucy (or Geoffrey de Crunes (Craon)) by his wife Maud d'Avranches, the latter being heiress of Baldwin Fitz Gilbert's family, which had held the honour of Okehampton and the Shrievalty of Devon 1080-1142. [Burke's Peerage]
-------------------------------
William de Courcy, by wife, Maud d'Avranches, lady of Oakhampton, and of du Sap in Normandy, daughter and heir of Robert d'Avranches, lord of Oakhampton, co. Devon. [Ancestral Roots]