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In page Walter de Merton:

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Edward I had left England in 1268 to participate in the Ninth Crusade and, in the new king's absence, Merton stood in his place, effective Regent of England. Edward commanded the respect of his household and wardrobe anticipating a welcome return. This is signified in a letter of 9 August sent from Melun, France in which Walter was promised the King's full support.[3] However, on Edward's return to England, Walter was dismissed as Lord Chancellor on 21 September 1274, in favour of Robert Burnell, who became a strong ally of the Edwardian regime.[1] Walter's compensation for this was the Bishopric of Rochester, to which he was elected in late July and consecrated on 21 October 1274.[4][5]