House of Somerset & Dukes of Beaufort

House of Somerset (From Wikipedia):

Charles Somerset, 1st Earl of Worchester 

The House of Somerset came from the Beaufort family which originated in the illegitimate issue of John of Gaunt by his then-mistress Katherine Swynford. Gaunt married Swynford in 1396, as his third wife, and their children were subsequently legitimated both by his nephew King Richard II and by Pope Boniface IX. There were four children: John Beaufort, 1st Earl of Somerset (1373–1410); Cardinal Henry Beaufort, (1375–1447), Bishop of Winchester; Thomas Beaufort, Duke of Exeter (1377–1426) and Joan Beaufort, Countess of Westmorland (1379–1440).^[4] The House of Tudor was descended from the Beauforts in the female line and all subsequent English and British monarchs are descended from the first Tudor King, Henry VII.

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.

Dukedom of Beaufort (From Wikipedia):

The Dukedom of Beaufort is a title in the Peerage of England. It was created by Charles II in 1682 for Henry Somerset, 3rd Marquess of Worcester, a descendant of Charles Somerset, 1st Earl of Worcester, legitimised son of Henry Beaufort, 3rd Duke of Somerset, a Lancastrian leader in the Wars of the Roses. The name Beaufort refers to a castle in Champagne, France (now Montmorency-Beaufort). It is the only current dukedom to take its name from a place outside the British Isles. The Dukes of Beaufort descend in the male line from the House of Plantagenet through John of Gaunt, son of Edward III. 

Dukedom of Beaufort Coat of Arms (Wikipedia)

Descent from Edward III & Plantaganets (From Wikipedia):

• John of Gaunt, son of King Edward III and father of King Henry IV of England
• John Beaufort, 1st Earl of Somerset, natural and legitimized son of John of Gaunt by Katherine Swynford
• Edmund Beaufort, 4th Earl and 2nd Duke of Somerset, fourth and youngest son of the 1st Earl
• Henry Beaufort, 3rd Duke of Somerset, son of the 4th Earl and 2nd Duke of Somerset; his natural son was created Earl of Worcester in 1514.

• Charles Somerset, 1st Earl of Worcester (c. 1450–1526), legitimised son of Henry Beaufort, 3rd Duke of Somerset and Joan Hill

Other titles (2nd onwards): Baron Herbert (1461)

• Henry Somerset, 2nd Earl of Worcester (c. 1495–1548), only legitimate son of the 1st Earl
• William Somerset, 3rd Earl of Worcester (d. 1589), eldest son of the 2nd Earl
• Edward Somerset, 4th Earl of Worcester (1553–1628), only son of the 3rd Earl
• Henry Somerset, 5th Earl of Worcester (1577–1646) was created Marquess of Worcester in 1643

Other titles: Earl of Worcester (1514) and Baron Herbert (1461)

• Henry Somerset, 1st Marquess of Worcester (1577–1646), eldest son of the 4th Earl, was a noted Cavalier
• Edward Somerset, 2nd Marquess of Worcester (1601–1667), eldest son of the 1st Marquess, was an inventor. He has a claim to the invention of the steam engine.
• Henry Somerset, 3rd Marquess of Worcester (1629–1700) was created Duke of Beaufort in 1682, after the Restoration
  • Henry Somerset, Lord Herbert (b. bef. 1660), eldest son of the 3rd Marquess, died in infancy

• Henry Somerset, 1st Duke of Beaufort (1629–1700), eldest son of the 2nd Marquess
  • Henry Somerset, Lord Herbert (b. before 1660), eldest son of the 1st Duke, died in infancy
  • Charles Somerset, Marquess of Worcester (1660–1698), second son of the 1st Duke, predeceased his father
• Henry Somerset, 2nd Duke of Beaufort (1684–1714), only son of Lord Worcester
• Henry Scudamore, 3rd Duke of Beaufort (1707–1745), eldest son of the 2nd Duke, died without issue
• Charles Noel Somerset, 4th Duke of Beaufort (1709–1756), second and youngest son of the 2nd Duke

Other titles (5th–10th Dukes): Baron Botetourt (1305; abeyance ended 1803)

• Henry Somerset, 5th Duke of Beaufort (1744–1803), only son of the 4th Duke
• Henry Charles Somerset, 6th Duke of Beaufort (1766–1835), eldest son of the 5th Duke
• Henry Somerset, 7th Duke of Beaufort (1792–1853), eldest son of the 6th Duke
• Henry Charles FitzRoy Somerset, 8th Duke of Beaufort (1824–1899), only son of the 7th Duke
• Henry Adelbert Wellington FitzRoy Somerset, 9th Duke of Beaufort (1847–1924), eldest son of the 8th Duke
• Henry Hugh Arthur FitzRoy Somerset, 10th Duke of Beaufort (1900–1984), only son of the 9th Duke, died without issue, at which point his two Baronies fell into abeyance.
• David Robert Somerset, 11th Duke of Beaufort (1928–2017), great-grandson of Rt. Hon. Lord Henry Richard Charles Somerset, second son of the 8th Duke
• Henry John FitzRoy Somerset, 12th Duke of Beaufort (b. 22 May 1952), eldest son of the 11th Duke.^[4]

The heir apparent is the present holder's son, Henry Robert FitzRoy Somerset, Marquess of Worcester (b. 20 January 1989).^[4]