Joan Stewart, Countess of Morton Scottish princess; third child of James I of Scotland and Joan Beaufort (1428–1493) Parents Joan Beaufort James I of Scotland Children John Douglas, 2nd Earl of Morton Lady Elizabeth Douglas James Douglas Lady Janet Douglas Siblings Isabella of Scotland, Duchess of Brittany Annabella of Scotland John Stewart, 1st Earl of Atholl James Stewart, 1st Earl of Buchan Mary Stewart, Countess of Buchan Margaret Stewart, Dauphine of France Alexander Stewart, Duke of Rothesay James II of Scotland Eleanor of Scotland Andrew Stewart Partners James Douglas, 1st Earl of Morton