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In page Alice de Toeni, Countess of Warwick:

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He had been previously married to Isabel de Clare, the daughter of Gilbert de Clare, 6th Earl of Gloucester and Alice de Lusignan of Angoulême, but the marriage, which had produced no children, was annulled. Guy had already distinguished himself in the Wars of Scottish Independence and was one of the Ordainers, who sought to restrict the powers of the king. Guy de Beauchamp was one of the chief adversaries of Piers Gaveston, King Edward's favourite, who often referred to Guy as The Mad Hound, due to the Earl's habit of foaming at the mouth when angry.[1] In 1312, Guy de Beauchamp captured Gaveston and took him to his principal residence Warwick Castle where Gaveston was held prisoner and afterwards murdered.[citation needed]