On 12 Feb 1424 King James I of Scotland (age 29) and Joan Beaufort Queen Consort Scotland (age 20) were married at Southwark Cathedral [Map]. She by marriage Queen Consort Scotland. She the daughter of John Beaufort 1st Marquess Somerset and Dorset and Margaret Holland Duchess Clarence (age 39). He the son of King Robert III of Scotland and Anabella Drummond Queen Consort Scotland. He a great x 5 grandson of King John "Lackland" of England. She a great granddaughter of King Edward III of England.