Edward I mobilised another army for the Scottish campaign in 1307, which Prince Edward was due to join that summer, but the elderly king had been increasingly unwell and died on 7 July at Burgh by Sands. Edward travelled from London immediately after the news reached him, and on 20 July he was proclaimed king. He continued north into Scotland and on 4 August received homage from his Scottish supporters at Dumfries, before abandoning the campaign and returning south. Edward promptly recalled Piers Gaveston, who was then in exile, and made him Earl of Cornwall, before arranging his marriage to the wealthy Margaret de Clare. Edward also arrested his old adversary Bishop Langton, and dismissed him from his post as treasurer. Edward I's body was kept at Waltham Abbey for several months before being taken for burial to Westminster, where Edward erected a simple marble tomb for his father.