John de Mowbray, 2nd Lord (Baron) Mowbray; allegedly born 4 Sep 1286; knighted 1306; served regularly against the Scots 1308-19, Keeper of the City and County of York 1312, Warden of the Marches towards Carlisle 1313 and Jan 1314/5, Captain and Keeper of Newcastle-upon-Tyne and Northumberland March 1314/5, Keeper of town and castle of Scarborough and manor and castle of Malton 1317; joined Thomas, Earl of Lancaster, in rebellion against Edward II; married 1298 Aline de Braose/Brewes, daughter and coheir of 1st and apparently last Lord (Baron) Brewes, and after being taken prisoner at the Battle of Boroughbridge 16 March 1321/2 was hanged 23 March at York, his corpse allegedly being kept dangling for around three years. [Burke's Peerage]
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John de Mowbray, Knight, 2nd Lord Mowbray of Thirsk, MP 1307-1321, warden of the marches near Carlisle and of the town and castle of Scarborough 1317, executed after the battle of Boroughbridge, at York, 23 Mar 1321/2. [Magna Charta Sureties]
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John de Mowbray, 2nd baron, summoned to parliament from 26 August, 1307, to 5 August, 1320. This nobleman, during his minority, was actively engaged in the Scottish wars of King Edward I, and had livery of all his lands before he attained majority in consideration of those services. In the 6th Edward II [1313], being then sheriff of Yorkshire and governor of the city of York, he had command from the king to seize upon Henry de Percy, then a great baron in the north, in consequence of that nobleman suffering Piers de Gaveston, Earl of Cornwall, to escape from Scarborough Castle in which he had undertaken to keep him in safety. The next year Lord Mowbray was in another expedition into Scotland, and he was then constituted one of the wardens of the marches towards that kingdom. In the 11th of the same reign [1318], he was made governor of Malton and Scarborough Castles, in Yorkshire, and the following year he was once more in Scotland, invested with authority to receive into protection all who should submit to King Edward, but afterwards taking part in the insurrection of Thomas, Earl of Lancaster, he was made prisoner with that nobleman and others at the battle of Boroughbridge and immediately hanged at York, anno 1321, when his lands were seized by the crown and Aliva, his widow, with her son, imprisoned in the Tower of London. This lady, who was dau. and co-heir of William de Braose, Lord Braose, of Gower, was compelled, in order to obtain some alleviation of her unhappy situation, to confer several manors of her own inheritance upon Hugh le Despencer, Earl of Winchester. In the next reign, however, she obtained from the crown a confirmation of Gowerland, in Wales, to herself and the heirs of her body by her deceased husband, with remainder to Humphrey de Bohun, Earl of Hereford and Essex, and his heirs. Lady Mowbray m. 2ndly, Sir R. de Peshale, Knt., and d. in the 5th Edward III [1332]. [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]