James Stewart, 1st Earl of Buchan Scottish earl; second son of Joan Beaufort and Sir James Stewart, the Black Knight of Lorn (1445–1499) Parents Joan Beaufort James Stewart, the Black Knight of Lorn Children Margaret Stewart James Stewart, 1st of Traquair Isabella Stewart Elizabeth Stewart Alexander Stewart, 2nd Earl of Buchan Agnes Stewart unknown daughter Stewart Siblings Annabella of Scotland Joan Stewart, Countess of Morton John Stewart, 1st Earl of Atholl Mary Stewart, Countess of Buchan Margaret Stewart, Dauphine of France Alexander Stewart, Duke of Rothesay Isabella of Scotland, Duchess of Brittany Andrew Stewart Eleanor of Scotland James II of Scotland Partners Margaret Murray Margaret Ogilvy