Ducal descendants of John of Gaunt's second son (from his 3rd marriage), John BEAUFORT (1st Earl of Somerset):
John BEAUFORT (born PLANTAGENET) (1st Earl of Somerset)Â (c. 1371-c.1410)
1. John (3rd Earl of Somerset) (1404-1444)
   (cr. 1st Duke of Somerset (E) (1443, Title extinct 1444)
1.1. Lady Margaret (1443-1509) m. Edmund TUDOR (1st Earl of Richmond) (c. 1430-1456)
1.1.1. King Henry VII of England (1457-1509)
1.1.1.1. King Henry VIII of England (1491-1547)
       (cr. 1st Duke of York (E) 1494, Title merged 1509)
1.1.1.2. Edmund (1499-1500)
       (nominated Duke of Somerset, Title extinct 1500)
2. Edmund (4th Earl of Somerset & 1st Marquess of Dorset) (c. 1406-1455)
   (cr. 1st Duke of Somerset (E) 1448)
2.1. Henry (c. 1436-1464)
    (2nd Duke of Somerset, Title forfeited 1461-1463, Title restored 1463, Title forfeited 1464)
2.1.1. (illegitimate) Charles SOMERSET (1st Earl of Worcester) (c. 1460-1526)
2.1.1.1. Henry (2nd Earl of Worcester (c. 1495-1549)
2.1.1.1.1. Lady Lucy (1523-1583) m. John NEVILL(E) (4th Baron Latymer) (c. 1520-1577)
2.1.1.1.1.1. Elizabeth (1545-1630) m. Sir John DANVERS (1540-1594)
2.1.1.1.1.1.1. Eleanor (1583-1601) m. Thomas WALMESLEY (d. c. 1642)
2.1.1.1.1.1.1.1. Anne (c. 1600-1666) m. Sir Edward OSBORNE (1st Bt.) (1596-1647)
2.1.1.1.1.1.1.1.1. Thomas (2nd Bt. & 1st Marquess of Carmarthen( (1632-1712)
                 (cr. 1st Duke of Leeds (E) 1694)
2.1.1.1.1.1.1.1.1.1. Peregrine (1659-1728)
                 (2nd Duke of Leeds)
2.1.1.1.1.1.1.1.1.1.1. Peregrine Hyde (1691-1731)
                   (3rd Duke of Leeds)
2.1.1.1.1.1.1.1.1.1.1.1. Thomas (1713-1789)
                     (4th Duke of Leeds)
2.1.1.1.1.1.1.1.1.1.1.1.1. Francis Godolphin (1751-1799) m. Amelia DARCY (suo jur/de jure 12th Baroness Darcy de Knayth & suo jure/de jure 9th Baroness Conyers) (1754-1854)
                      (5th Duke of Leeds)
2.1.1.1.1.1.1.1.1.1.1.1.1.1. George William Frederick (de jure 13th Baron Darcy de Knayth & 10th Baron Conyers) (1775-1838)
                        (6th Duke of Leeds)
2.1.1.1.1.1.1.1.1.1.1.1.1.1.1. Francis Godolphin (1798-1859)
                          (7th Duke of Leeds)
2.1.1.1.1.1.1.1.1.1.1.1.1.2. Francis (1st Baron Godolphin) (1777-1850)
2.1.1.1.1.1.1.1.1.1.1.1.1.2.1. George Godolphin (1802-1872)
                          (8th Duke of Leeds)
2.1.1.1.1.1.1.1.1.1.1.1.1.2.1.1. George Godolphin (1828-1895)
                            (9th Duke of Leeds)
2.1.1.1.1.1.1.1.1.1.1.1.1.2.1.1.1. George Godolphin (1862-1927)
                             (10th Duke of Leeds)
2.1.1.1.1.1.1.1.1.1.1.1.1.2.1.1.1.1. John Francis Godolphin (1901-1963)
                               (11th Duke of Leeds0
2.1.1.1.1.1.1.1.1.1.1.1.1.2.2. Lord Sydney (1808-1889)
2.1.1.1.1.1.1.1.1.1.1.1.1.2.2.1. Sidney (1835-1903)
2.1.1.1.1.1.1.1.1.1.1.1.1.2.2.1.1. Francis D'Arcy Godolphin (1884-1964)
                             (12th Duke of Leeds, Title extinct 1964)
2.1.1.1.1.2. Dorothy (c. 1546-1608) m. Thomas CECIL (1st Earl of Exeter) (1542-1622)
2.1.1.1.1.2.1. Lady Lucy (1568-1614) m. William PAULET (4th Marquess of Winchester) (c. 1560-1628)
2.1.1.1.1.2.1.1. John (5th Marquess of Winchester) (c. 1598-1675)
2.1.1.1.1.2.1.1.1. Charles (6th Marquess of Winchester) (c. 1630-1699)
                (cr. 1st Duke of Bolton (E) 1689)
2.1.1.1.1.2.1.1.1.1. Charles (1661-1722)
                 (2nd Duke of Bolton)
2.1.1.1.1.2.1.1.1.1.1. Charles (1685-1754)
                   (3rd Duke of Bolton)
2.1.1.1.1.2.1.1.1.1.2. Harry (1691-1759)
                   (4th Duke of Bolton)
2.1.1.1.1.2.1.1.1.1.2.1. Charles (c. 1718-1765)
                     (5th Duke of Bolton)
2.1.1.1.1.2.1.1.1.1.2.2. Harry (1720-1794)
                     (6th Duke of Bolton, Title extinct 1794)
2.1.1.1.2. William (3rd Earl of Worcester) (c. 1527-1589)
2.1.1.1.2.1. Edward (4th Earl of Worcester) (c.1550-1628)
2.1.1.1.2.1.1. Henry (5th Earl of Worcester & 1st Marquess of Worcester) (1577-1646)
2.1.1.1.2.1.1.1. Edward (2nd Marquess of Worcester) (1601-1667)
2.1.1.1.2.1.1.1.1. Henry (3rd Marquess of Worcester) (1629-1699)
                (cr. 1st Duke of Beaufort (E) 1682)
2.1.1.1.2.1.1.1.1.1.Charles (Marquess of Worcester (1660-1698)
2.1.1.1.2.1.1.1.1.1.1. Henry (1684-1714)
                   (2nd Duke of Beaufort)
2.1.1.1.2.1.1.1.1.1.1.1. Henry (1707-1745)
                     (3rd Duke of Beaufort)
2.1.1.1.2.1.1.1.1.1.1.2. Charles Noel (1709-1756)
                     (4th Duke of Beaufort)
2.1.1.1.2.1.1.1.1.1.1.2.1. Henry (1744-1803)
                      (5th Duke of Beaufort)
2.1.1.1.2.1.1.1.1.1.1.2.1.1. Henry Charles (1766-1835)
                        (6th Duke of Beaufort)
2.1.1.1.2.1.1.1.1.1.1.2.1.1.1. Henry (1792-1853)
                          (7th Duke of Beaufort)
2.1.1.1.2.1.1.1.1.1.1.2.1.1.1.1.Henry Charles FitzRoy (1824-1899)
                           (8th Duke of Beaufort)
2.1.1.1.2.1.1.1.1.1.1.2.1.1.1.1.1. Henry Adelbert Wellington FitzRoy (1847-1924)
                             (9th Duke of Beaufort)
2.1.1.1.2.1.1.1.1.1.1.2.1.1.1.1.1.1. Henry Hugh Arthur FitzRoy (1900-1984)
                               (10th Duke of Beaufort)
2.1.1.1.1.1.1.2.1.1.1.1.1.1.1.1.2. Lord Henry (1849-1932)
2.1.1.1.2.1.1.1.1.1.1.2.1.1.1.1.2.1. Henry (1874-1945)
2.1.1.1.2.1.1.1.1.1.1.2.1.1.1.1.2.1.1. Henry (1898-1965)
2.1.1.1.2.1.1.1.1.1.1.2.1.1.1.1.2.1.1.1. David Robert (1928-2017)
                                   (11th Duke of Beaufort)
2.1.1.1.2.1.1.1.1.1.1.2.1.1.1.1.2.1.1.1.1. Henry John FitzRoy (1952-Â Â Â )
                                    (12th Duke of Beaufort)
2.2. Lady Eleanor (c. 1440-1501) m. Sir Robert SPENCER (1430-after 1492)
2.2.1. Margaret (b.c. 1480) m. Thomas CAREY (d.c. 1536)
2.2.1.1. William (c. 1495-1528) m. Lady Mary BOLEYN (btwn 1500 &Â 1504-1543)
2.2.1.1.1. Catherine (c. 1524-1569) m. Sir Francis KNOLLYS
2.2.1.1.1.1. Catherine (1559-1632) m. Sir Philip BOTELER
2.2.1.1.1.1.1. Sir John
2.2.1.1.1.1.1.1. Catherine (1625-1698) m. Sir John GORE (1621-1697)
2.2.1.1.1.1.1.1.1. Anne (c. 1660-1725) m. Paul GORE (d. 1689)
2.2.1.1.1.1.1.1.1.1. Sir Arthur (2nd Bt.) (c. 1685-1741)
2.2.1.1.1.1.1.1.1.1.1. Arthur (3rd Bt. & 1st Earl of Arran) (1703-1773)
2.2.1.1.1.1.1.1.1.1.1.1. Arthur (2nd Earl of Arran) (1734-1809) m. Elizabeth UNDERWOOD (d. 1829)
2.2.1.1.1.1.1.1.1.1.1.1.1. Lady Cecilia (Cecilia Letitia)Â (c. 1785-1873) m. Prince Augustus of Great Britain (1st Duke of Sussex) (1773-1843)
                      (cr. Duchess of Inverness (UK) 1840 for life, Title extinct 1873)
3. Joan (d. 1445) m. Sir James STEWART OF LORNE (D.C. 1448)
3.1. James (1st Earl of Buchan) (d. btwn 1497 & 1500)
3.1.1. (illegitimate) Agnes (d. 1557) m. Adam HEPBURN (2nd Earl of Bothwell) (c. 1492-1513)
3.1.1.1. Patrick (3rd Earl of Bothwell) (d. 1566)
3.1.1.1.1. James (4th Earl of Bothwell) (c. 1535-1578) m. Queen Mary of Scotland (1542-1587)
         (cr. 1st Duke of Orkney (S) 1567, Title forfeited 1567)