Who dated Alexander Stewart, Earl of Mar?

Alexander Stewart (c. 1375 - July 1435) was a Scottish nobleman and warlord. An illegitimate grandson of Robert II of Scotland, he held the title of Earl of Mar, exercising significant power over northeastern Scotland. His military career included service in the Duchy of Burgundy, along with battles at Harlaw, Lochaber, and Inverlochy against the Lordship of the Isles.