General Notes

Roger de Mowbray, 1st Lord (Baron) Mowbray, so created by writ of summons to Parliament 24 June 1295 according to later doctrine, although in a House of Lords decision of 1877 (now generally held to be flawed) a date of 28 June 1283 was assigned as the valid Parliament to which Roger's summoning created him a peer; called up for military service against the Welsh 1282 and 1283 and against the Scots 1291, also in Gascony 1294; married 1270 Roese (sic), daughter of Richard de Clare, Earl of Gloucester and Hertford by his 2nd wife Maud, daughter of John de Lacy, Earl of Lincoln, and died by 21 Nov 1297.  [Burke's Peerage]

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Roger de Mowbray, Knight; 1st Lord Mowbray of Thirsk and Hovingham, MP 1295-1297.  [Magna Charta Sureties]

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Roger de Mowbray, making proof of his age in the 6th Edward II [1313], had livery of his lands. He was engaged in the wars of Wales and Gascony and was summoned to parliament as a Baron, from 23 June, 1295, to 26 August, 1296. He lordship m. Rose, great-grand-dau. of Richard de Clare, Earl of Hertford, and dying in 1298, left two sons, John, his heir, and Alexander, who went to Scotland. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 387, Mowbray, Earls of Nottingham, Dukes of Norfolk, Earls-Marshal, Earls of Warren and Surrey]