Joan was the daughter of John, Ist Earl of Somerset and was to become Queen of Scotland. She met her husband, James, the future king Scotland, while he was being held captive by the English. Because of his status he was treated well and given an excellent education. During this time he met Joan and fell in love with her. After his release from captivity in 1424 they were married and both he and Joan travelled to Scotland to claim the Scottish throne. In 1437 Joan became aware of a plot to kill her husband, so she travelled to Roxburgh were her was staying to warn him. They took refuge in an abbey near Perth but the assassins gained access to their room and even though Joan put herself between the attackers and James, the King was murdered. After the King's death his and Joan's son became King of Scotland at the age of six. Joan married James Stewart, the Black Knight.

 Beaufort, Joan (b.1404? - d.1445)
    +James (I, King of Scotland 1406-1437) (b.1394 - d.1437)
        = Margaret (Stewart) ( - d.1445)
        |   +Louis (XI, King of France 1461-1483)
        = Isabella (Stewart) ( - d.1494)
        = Eleanor (Stewart) ( - d.1480)
        = James (II, King of Scotland 1437-1460) (b.1430 - d.1460)
        |   +Mary (of Guelders) (b.1433 - d.1463)
        |       = James (III, King of Scotland 1460-1488) (b.1452? - d.1488)
        |       |   +Margaret (of Denmark) (b.1456 - d.1486)
        |       |       = James (IV King of Scotland 1488-1513) (b.1473 - d.1513)
        |       = Stewart, Alexander (Duke of Albany) (b.1454? - d.1485)
        = Joan (Stewart) ( - d.1480)