Margaret married Earl of Somerset John Beaufort on 28 Sep 1397. John (son of Duke of Lancaster John Plantagenet and Catherine Swynford Roet) was born in 1373; died on 16 Mar 1410 in St. Katherine by the Tower, London, Greater London, England, United Kingdom. [Group Sheet] [Family Chart]

1. Duke of Somerset John Beaufort was born in 1404; died on 27 May 1444 in Wimborne, Dorset, England, United Kingdom.
2. 2nd Earl of Somerset Henry Beaufort was born on 26 Nov 1401; died on 25 Nov 1418.
3. Queen of Scots Joan Beaufort died on 15 Jul 1145.
4. Count of Perche Thomas Beaufort was born in 1405; died on 2 Oct 1430 in Louviers France.
5. Duke of Somerset Edmund Beaufort was born in 1406; died on 22 May 1455.
6. Countess of Devon Margaret Beaufort was born in 1409 in Westminister; died in 1449.