General Notes

William de Mowbray, Magna Charta Surety 1215, of Thirsk and Slingsby, crusader 1193, Baron of Axholme, d. Axholme 1222; m. Avice (or Agnes), "daughter of the Earl of Arundel."  [Magna Charta Sureties]

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William; supporter of King John at the time of the latter's loss of Normandy to the French 1204-5, whereby the original Montbrai possessions were alienated; accompanied John to Ireland 1210 but joined baronial opposition to John over the Magna Carta 1215, to enforce which he was one of the 25 magnates appointed; excommunicated by Innocent III at John's request after prolonged opposition to him, his estates being confiscated also; captured at the Battle of Lincoln May 1217 fighting for the French King against Henry III but submitted to latter Oct 1217 and got back his estates; married Avice and died by March 1223/4.  [Burke's Peerage]

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William de Mowbray, who, in the 6th Richard I [1195], paying £100 for his relief, had livery of his lands. This feudal lord, upon the accession of King John [1199], was tardy in pledging his allegiance and, at length, only swore fealty upon condition that the king should render to every man his right. At the breaking out of the baronial war, it was no marvel that he should be found one of the most forward of the discontented lords and so distinguished that he was chosen with his brother, Roger, amongst the twenty-five celebrated barons appointed to enforce the observance of Magna Carta. In the reign of Henry III, adhering to the same cause, he was at the battle of Lincoln and taken prisoner there, when his lands were seized and bestowed upon William Mareshal, the younger, but he was subsequently allowed to redeem them, after which he appears to have attached himself to the king and was with the royal army at the siege of Bitham Castle, in Lincolnshire. He m. Agnes, dau. of the earl of Arundel, and dying in 1222, was s. by his elder son, Nigel 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]

One of the 25 Barons appointed to enforce Magna Carta.