(4) ROBERT the Kingís son, whose mother Ede or Edith was apparently da. of Forn, probably identical with Forn Sigulfson, lord of Greystoke (Cumberland) and a tenant-in-chief in co. York; which Edith, after her liaison with Henry I, m. Robert de Oilli, a royal Constable and constable of Oxford Castle. Robert held land in Devonshire in 1130. He supported his half-sister, the EMPRESS Maud, in the Civil War. He was a great tenant-in-chief, his servitium debitum being 100 knights. He m. Maud, dame du Sap in Normandy, widow of William de Courcy, and da. and h. of Robert de Avranches, by whom he had an only daughter. He d. 31 May 1172.