BIOGRAPHY: Thomas de Berkeley, 3rd Baron Berkeley; knighted before 1322, joined with his father in Lancaster's insurrection, imprisoned until 16 Oct 1326, later Jt Custodian of Edward II 4 April 1327 but guessing what was in store for the deposed king left Berkeley Castle before the actual regicide, tried by jury of 12 knights 1330/1 as accessory to Edward's murder but acquitted, Chief Warden Glos, Worcs, and Herefs, Marshal English Army in France 1342, Capt Scottish Marches, Warden and Chief Justice in Eyre South of Trent 1345-48. [Burke's Peerage]
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BIOGRAPHY: Thomas, 3rd baron, m. 1st, Margaret, dau. of Roger Mortimer, Earl of March, and 2ndly, in 1347, Catherine, dau. of Sir John Clyvedon, widow of Sir Peter le Veel. This lord having adhered to the interest of the Queen, Mortimer, and Prince Edward, afterwards the third of that name, furnished "the only precedent," says Smith, "of a peer being tried by knights, as the peers would have been both judges and jurors." He first assumed a mitre for his crest. He was summoned to parliament from 1329 to 1360. He had issue by his 1st wife, besides his heir, three sons, who d. s. p., and one dau., Joan, wife of Sir Reginald Cobham; by his 2nd wife, had had, with three sons, who d. s. p., a 4th, John, ancestor of the Berkeleys of Beverstone. He d. 1361 and was s. by his son, Maurice, 4th baron. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 44, Berkeley, Viscount Berkeley, Earl of Nottingham, and Marquess of Berkeley