Roger de Mowbray, of Thirsk and Slingsby, minor 2 Oct 1230 when he succeeded his brother Nele, d. about Nov 1266; m. Maud, d. bef. Apr 1273, daughter of William de Beauchamp, Lord Beauchamp of Bedford; she m. (2) Roger le Strange. [Magna Charta Sureties]
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Roger [2nd son, elder brother Nele dsp 1230]; seemingly took Henry III's part in Barons' War in 1260s; married Maud (married 2nd as his 1st wife, 1st and last Lord (Baron) Strange (of Ellesmere), eldest daughter of William de Beauchamp, and died c Nov 1266. [Burke's Peerage]
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Roger de Mowbray, then in minority [1228], s. his brother, Nigel. This feudal lord had several military summonses to attend King Henry III into Scotland and Wales. He m. Maud, dau. of William de Beauchamp, of Bedford, and dying in 1266, was s. by his eldest son, Roger de Mowbray. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 386, Mowbray, Earls of Nottingham, Dukes of Norfolk, Earls-Marshal, Earls of Warren and Surrey]