Douglas' military achievements inevitably increased his political standing still further. When Edward Bruce, the king's brother and designated successor, was killed in Ireland at the Battle of Faughart in the autumn of 1318, Douglas was named as Guardian of the Realm and tutor to the future Robert II, after Randolph if Robert should die without a male heir. This was decided at a parliament held at Scone in December 1318, where it was noted that "Randolph and Sir James took the guardianship upon themselves with the approbation of the whole community."