John Beaufort, 1st Duke of Somerset (baptized
March 25,
1404 -
May 27,
1444), 2nd Earl of Somerset (1410-1444), and subsequently first Duke of Somerset (1443-1444). Son of
John Beaufort, 1st Earl of Somerset. In 1443 he was promoted from earl to duke and appointed Captain-General of Guyenne. However he proved a poor commander. This duke married Margaret Beauchamp in
1439, and they had one child,
Margaret Beaufort (
May 31,
1443 -
June 29,
1509), who was the mother of
Henry VII of England.