Source: Burke, Dormant & Extinct Peerages, 18.
From: Encarta
The Treason of Bartholomew de Badlesmere
He was indebted to the crown for numerous charters for fairs throughout his extensive manors; and he held the high office of steward of the household for a great number of years; but notwithstanding his thus basking in the sunshine of royal favor, his allegiance was not trustworthy, for joining the banner of Thomas, Earl of Lancaster, and other discontented nobles of that period, he went into Kent without the king's permission; where, being well received, he put himself at the head of some soldiers from his castle at Ledes, and thence proceeded to Canterbury, with 19 knights, having linen jackets under their surcoats, all his esquires being in plate armor, and thus repaired to the shrine of St. Thomas, to the amazement of the good citizens. While Lord Badlesmere remained at Canterbury, John de Crumwell and his wife sought his lordship's aid, and , pledging himself to afford it, he hastened to Oxford, where the barons of his party had been then assembled. In the meantime the King being apprised of the baron's proceedings, dispatched the Queen to Ledes, and upon admission being denied her, the castle was regularly invested by Adomere de Valence, Earl of Pembroke, and John de Britannia, Earl of Richmond, to whom it eventually surrendered, when Lord Badlesmere's wife, young son, and daughters, all falling into the hands of the besiegers, were sent prisoners to the Tower of London. The baron and his accomplices afterwards were pursued by Edmund, Earl of Kent, and John de Warren, Earl of Surrey, and being defeated and taken prisoners at the battle of Boroughbridge, his lordship was hanged, drawn, and quartered at Canterbury, and his head set upon a pole at Burgate. At the time of the baron's execution upwards of ninety lords, knights, and others concerned in the same insurrection, suffered a similar fate in various parts of the kingdom. He married Margaret Clare, one of the daughters and co-heiresses of Thomas de Clare, 3rd son of Thomas de Clare, 2nd son of Richard de Clare, Earl of Gloucester. His widow continued as a prisoner in the Tower, until, through the influence of William Roos, Lord Roos, of Hamlake, and others, she obtained her freedom. Whereupon she went to the nunnery of Minoresses, outside of Adgate, in the suburbs of London. She had 2-shillings a day for her maintenance, to be paid by the sheriff of Essex; she subsequently, however, obtained a large proportion of the deceased lords' manors as her dowry.