In March 1302, Bruce sent a letter to the monks at Melrose Abbey apologising for having called tenants of the monks to service in his army when there had been no national call-up. Bruce pledged that, henceforth, he would "never again" require the monks to serve unless it was to "the common army of the whole realm", for national defence. Bruce also married his second wife that year, Elizabeth de Burgh, the daughter of Richard de Burgh, 2nd Earl of Ulster. By Elizabeth he had four children: David II, John (died in childhood), Matilda (who married Thomas Isaac and died at Aberdeen 20 July 1353), and Margaret (who married William de Moravia, 5th Earl of Sutherland in 1345).