John Beaufort, 1st Earl of Somerset
Marquess of Dorset
John Beaufort, 1st Marquess of Somerset and 1st Marquess of Dorset, later only 1st Earl of Somerset, KG was an English nobleman and politician. He was the first of the four children of John of Gaunt by his mistress Katherine Swynford, whom he... Wikipedia
Born: 1373, Montmorency-Beaufort, France
Died: March 16, 1410 (age 37 years), Royal Foundation of St Katharine
Parents: John of Gaunt and Katherine Swynford
Siblings: Joan Beaufort, Countess of Westmorland and Henry IV of England
Spouse: Margaret Holland, Duchess of Clarence (m. 1397–1410)
Grandchildren: Margaret Beaufort, Henry Beaufort, 3rd Duke of Somerset, Edmund Beaufort, and more