sentences:  Robert II's third son was Robert Stewart, 1st Duke of Albany, who was Regent of Scotland during part of the reigns of his father, brother, and nephew James I of Scotland.Robert II's fourth son was Alexander Stewart, Earl of Buchan, who was famed as the "Wolf of Badenoch" and was responsible for the destruction of Elgin Cathedral.When James I of Scotland came of age, he curbed the power of his cousins, the Albany Stewarts.