John de Beaufort, 1st Marquess of Somerset, 1st Marquess of Dorset, 1st Earl of Somerset, was born circa 1371 to John of Gaunt, 1st Duke of Lancaster (1340-1399) and Catherine De Roet (1350-1403) and died 16 March 1409 of unspecified causes. He married Margaret Holland (1385-1439) 28 September 1397 JL . Notable ancestors include Henry II of England (1133-1189), William I of England (1027-1087), Charlemagne (747-814), Hugh Capet (c940-996), Alfred the Great (849-899). Ancestors are from Belgium, the United Kingdom, Spain, France, Germany, Portugal, Russia, Ukraine, Hungary, the Netherlands, Italy, Turkey, the Byzantine Empire, the United States, Sweden.


Offspring of John Beaufort, 1st Earl of Somerset and Margaret Holland (1385-1439)
Name Birth Death Joined with
Margaret Beaufort (c1400-1449)
Henry Beaufort, 2nd Earl of Somerset (1401-1418)
John Beaufort, 1st Duke of Somerset (1404-1444) 25 March 1404 27 May 1444 Margaret Beauchamp (c1410-1482)

Thomas Beaufort, Earl of Perche (1405-1432)
Joan Beaufort (c1406-1445) 1406 15 July 1445 Dunbar, East Lothian James I, King of Scotland (1394-1437)
James Stewart (c1383-aft1451)

Edmund Beaufort, 2nd Duke of Somerset (1406-1455) 1406 22 May 1455 Eleanor Beauchamp (1408-1467)

Common ancestors of John Beaufort, 1st Earl of Somerset (c1373-1410) and Margaret Holland (1385-1439)

  1. Blanche of Artois (1248-1302)
  2. Edward I of England (1239-1307)
  3. Henry III of England (1207-1272)
  4. Philippe III Capet (1245-1285)
  5. Éléonore de Provence (1223-1291)

Footnotes (including sources)

‡ General