John de Beaufort, 1st Earl of Somerset was the son of John of Gaunt, Duke of Lancaster and Katherine Roët, and his father was the son of Edward I., King of England and his wife Philippe de Hainaut. 1John de Beaufort, 1st Earl of Somerset was born illegitimately between 1371 and 1373 at Beafort Castle, England. He married Lady Margaret de Holand, daughter of Thomas de Holand, 2nd Earl of Kent and Alice FitzAlan, before
28 September 1397. He died on 16 March 1409/10 at Hospital of
St. Katherine-by-the-Tower, The City, London, England. He was buried at Canterbury Cathedral, Canterbury, Kent, England. He
was invested as a Knight, Order of the Garter (K.G.) circa 1397 In
February 1397 his illegitimate birth was legitimated by Parliament and
Papal decree. He was created 1st Earl of Somerset [England] on 10
February 1397.1 He was created 1st Marquess of Somerset [England] on 29
September 1397 He was created 1st Marquess of Dorset [England] on 29
September 1397. He was deposed as Marquess of Dorset and Somerset
on 3 November 1399. He held the office of Constable of England in
1404. He has an extensive biographical entry in the Dictionary of
National Biography .
Children of John de Beaufort, 1st Earl of Somerset and Lady Margaret de Holand were:
- Lady Joan Beaufort born 1406 Middlesex, England, died 15 July 1445
- Lady Margaret Beaufort, born circa 1400, died November 1449
- Henry Beaufort, 2nd Earl of Somerset born 26 November 1401, died 25 November 1418
- John Beaufort, 1st Duke of Somerset born before 25 Mar 1404, died 27 May 1444
- Thomas Beaufort, Earl of Perche born 1405, died 1432
- Edmund Beaufort, 1st Duke of Somerset born circa 1406, died 22 May 1455
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