He renounced his claim to some disputed Marches in lower Lauderdale to the monks of Melrose, and in 1235 he, with Adam, Abbot of Melrose, and Gilbert, Bishop of Galloway, led an expedition against the Galloway revolt of 1234–1235.
Shortly after 1242 the Earl of Dunbar was sent to subdue the rebellious Thane of Argyll.
The Earl held first rank among the twenty-four barons who guaranteed the Treaty of Peace with England in 1244.
Holinshed relates, he accompanied Lindsay of Glenesk and Stewart of Dundonald to crusade, where he died in 1249 at the siege of Damietta in Egypt.
Before 1213, he married Euphemia (d. 1267 at Whittingehame),[3][4] whom historians had previously believed to be daughter of Walter FitzAlan, 3rd High Steward of Scotland and lord of Kyle, Strathgryfe and Bute.