The House of Beaufort

House of Beaufort (From Wikipedia):

 Is an English noble and quasi-royal family and cadet branch of the House of Plantagenet, which originated in the fourteenth century as the legitimated issue of John of Gaunt, 1st Duke of Lancaster^[3] (the third surviving son of King Edward III), whose eldest legitimate son was King Henry IV, the first Lancastrian king. The Beauforts played an important role during the Wars of the Roses in the fifteenth century and the eventual heiress of the family Lady Margaret Beaufort was the mother of King Henry VII, the first Tudor monarch of England.

Beaufort Coat of Arms (Wikipedia)

The name Beaufort refers to the estate of Montmorency-Beaufort in Champagne, France, an ancient and seemingly important possession of the House of Lancaster. It is earliest associated with Edmund Crouchback, 1st Earl of Lancaster (1245-1296) (the younger son of King Henry III) whose third son John of Lancaster (1286-1317) was called "Seigneur of Beaufort". The estate of Beaufort was eventually inherited, with other vast possessions, by John of Gaunt, 1st Duke of Lancaster (third surviving son of King Edward III) following his marriage to the heiress Blanche of Lancaster.

Notable Beauforts:

• John Beaufort, 1st Earl of Somerset (c. 1371–1410).
  • Henry Beaufort, 2nd Earl of Somerset (c. 1401–1418).
  • John Beaufort, 1st Duke of Somerset (c. 1404–1444).
    • Margaret Beaufort, Countess of Richmond and Derby (1443–1509), mother of King Henry VII of England
  • Joan Beaufort, Queen of Scotland (c. 1404–1445)
  • Thomas Beaufort, Count of Perche (c. 1405–1431)
  • Edmund Beaufort, 2nd Duke of Somerset (c. 1406–1455).
    • Henry Beaufort, 3rd Duke of Somerset (1436–1464).
    • Margaret Beaufort, Countess of Stafford (c. 1427–1474)
    • Edmund Beaufort, 4th Duke of Somerset (c. 1438–1471).
    • John Beaufort, Marquess of Dorset (c. 1441–1471)
  • Margaret Beaufort, Countess of Devon (1409–1449)
• Henry Beaufort (c. 1375–1447), Cardinal Bishop of Winchester
• Thomas Beaufort, Duke of Exeter (c. 1377–1426)
• Joan Beaufort, Countess of Westmorland (c. 1379–1440)
• Cecily Neville, Duchess of York (1415–1495), mother of Kings Edward IV and Richard III of England

House of Somerset (From Wikipedia):

The House of Beaufort continues to exist in a further illegitimate line, surnamed "Somerset", the senior representative of which is Henry Somerset, 12th Duke of Beaufort, who is thus a direct male-line descendant, albeit via a legitimated and an illegitimate line, of King Henry II, the first Plantagenet King of England. The present King therefore has a far more complex biological relationship to their common ancestor. However a decree of King Henry IV in 1406 barred his legitimated half-siblings and their issue from any claim to the throne and the illegitimacy of the Somerset branch doubly bars them.