Line 185 Revised for 8th Edition
1. ROBERT OF MORTAIN, b. 1031, d. 8 Dec 1090, Earl of Cornwall, half bro. of WILLIAM I (121-24), the Conqueror and companion at the battle of Hastings, 1066; m. (1) Mathilda de Montgomery, dau. of Roger de Montgomery, d. 1094, Earl of Shrewsbury, Viscount of the Hiesmois, Seigneur of Montgomeri in Normandy, by his 1st wife, Mabel Talvas, d. 1079, dau. & h. of William Talvas, d. 1070, lord of Belleme, Seigneur of Alancon (a kinsman of Robert, Duke of Normandy). (CP III: 427-7, Xl: 687; Moriarty, The Plantagenet Ancestry, p. 44; ES III.4/637, 694B)