Stewart of Balquhidder is a Perthshire branch of the Stewart clan and scions of the royal House of Stewart from an illegitimate branch. They are descended from Sir William Stewart of Baldorran, who was the great grandson of Murdoch Stewart, Duke of Albany, executed by King James I of Scotland for treason in 1425. Murdoch Stewart was himself the grandson of King Robert II of Scotland, who founded the Stewart dynasty.