He was the son of James Stewart, 5th High Steward of Scotland and Cecilia of Dunbar daughter of Earl Patrick of Dunbar.
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It descended to George de Dunbar, 11th Earl of March, who was forfeited by parliament of his titles & estates in 1435, and retired into obscurity in England.
The right wing, composed of the men of Argyle, Lennox, Athole, and Galloway, was commanded by Alexander Stewart, 4th High Steward of Scotland, while Patrick III, Earl of Dunbar, commanded the left, composed of the men of Fife, Stirling, Berwick, and Lothian.
Rymer, Thomas,Foedera Conventiones, Literae et cuiuscunque generis Acta Publica inter Reges Angliae.