Joan (The Dumb Lady) Stewart was born circa 1428 in United Kingdom to James I of Scotland (1394-1437) and Joan Beaufort (c1406-1445) and died after 16 October 1486 of unspecified causes. She married James Douglas, 3rd Earl of Angus (-1446) 18 October 1440 JL in United Kingdom. She married James Douglas, 1st Earl of Morton (-1493) 15 May 1459 JL in United Kingdom. Alfred the Great (849-899)/s, Charlemagne (747-814)/s, Henry II of England (1133-1189)/s, Hugh Capet (c940-996)/s, William I of England (1027-1087)/s, Robert I of Scotland (1274-1329)/s, Rollo of Normandy (860-932)/s.
|Offspring of Joan (The Dumb Lady) Stewart and James Douglas, 1st Earl of Morton (-1493)|
|John Douglas, 2nd Earl of Morton (bef1466-1513)||1466||9 September 1513 England, United Kingdom||Janet Crichton (1461-)|
|James Douglas (-aft1480)|
|Janet Douglas (bef1481-)|
|Elizabeth Douglas (bef1480-)|