John Beaufort, 1st Duke of Somerset Duke of Somerset (1404–1444) Parents Margaret Beaufort, Countess of Somerset John Beaufort, 1st Earl of Somerset Children John of Somerset Thomasine Beaufort Margaret Beaufort Siblings Edmund Beaufort, 2nd Duke of Somerset Thomas Beaufort, Count of Perche Joan Beaufort Margaret Beaufort, Countess of Devon Henry Beaufort, 2nd Earl of Somerset Partners NN Margaret Beauchamp of Bletso
