Family tree of the
Dukes of: Beaufort, Dorset, Lancaster, and Somerset,
Marquesses of: Dorset, Hertford, Somerset and Worcester, and
Earls of: Dorset, Hertford, Lancaster, Leicester, Middlesex, Somerset, and Worcester
Earl of Dorset (possible 1st creation), 1070
Saint Osmund
(d. 1099)
Bishop of Salisbury and possible Earl of Dorset		Roger de Beaumont
(c. 1015–1094)
Earl of Dorset (1st creation) discontinued, 1099
Earl of Leicester (1st creation), 1107
King Henry I
(c. 1068–1135)		King Stephen
(1092/1096–1154)		Robert de Beaumont
(c. 1040/1050–1118)
1st Earl of Leicester		Henry de Beaumont
(d. 1119)
1st Earl of Warwick
Earl of Worcester (1st creation), 1138
Robert FitzRoy
(c. 1090–1147)
1st Earl of Gloucester		Matilda
(d. bef. 1141)		Waleran de Beaumont
(1104–1166)
Earl of Worcester		Robert de Beaumont
(1104–1168)
2nd Earl of Leicester		Hugh de Beaumont
(b. 1106)
1st Earl of Bedford
Earldom of Worcester (1st creation) extinct, 1166
William FitzRobert
(1116–1183)
2nd Earl of Gloucester		Hawise de BeaumontRobert de Beaumont
(d. 1190)
3rd Earl of Leicester
Robert de Beaumont
(d. 1204)
4th Earl of Leicester		Amice
Countess of Rochefort
King John
(1166–1216)		Isabella
(1173/1174–1217)
Countess of Gloucester		Simon de Montfort
(c. 1175–1218)
5th Earl of Leicester
King Henry III
(1207–1272)		Eleanor of EnglandSimon de Montfort
(c. 1208–1265)
6th Earl of Leicester
Earldom of Leicester (1st creation) forfeited, 1265
Earl of Leicester (2nd creation), 1267
Earl of Lancaster, 1276
King Edward I
(1239–1307)		Edmund Crouchback
(1245–1296)
1st Earl of Leicester, 1st Earl of Lancaster
Earldom of Leicester (1st creation) restored, 1324
Earldom of Lancaster restored, 1327
King Edward II
(1284–1327)		Thomas of Lancaster
(1278–1322)
2nd Earl of Leicester, 2nd Earl of Lancaster		Henry of Lancaster
(1281–1345)
3rd Earl of Leicester, 3rd Earl of Lancaster
Earldom of Leicester (1st creation) forfeited, 1322
Earldom of Lancaster forfeited, 1322
Duke of Lancaster, 1351
King Edward III
(1312–1377)		Henry of Grosmont
(c. 1310–1361)
4th Earl of Leicester, Duke of Lancaster		Joan of Lancaster
(c. 1312–1349)		John (II) de Mowbray
(1310–1361)
3rd Baron Mowbray		Eleanor of Lancaster
(1318–1372)		Mary of Lancaster
(c. 1320–1362)
Earl of Worcester (2nd creation), 1397
John of Gaunt
(1340–1399)
(6th) Earl of Leicester (jure uxoris), Duke of Lancaster		Blanche of Lancaster
(1342–1368)		Maud of Lancaster
(1340–1362)
a.k.a. Matilda, Countess of Hainault		William
(1330–1389)
Duke of Bavaria
Count of Holland
(5th) Earl of Leicester (jure uxoris)		Richard Fitzalan
(1346–1397)
Earl of Arundel		Thomas Percy
(1343–1403)
Earl of Worcester
Earldom of Worcester (2nd creation) extinct, 1403
Roger La Warr
(1326–1370)		Eleanor Mowbray
Earl of Somerset (1st creation), 1397
Marquess of Somerset and Marquess of Dorset (1st creation), 1397		Earl of Dorset (2nd creation), 1411
Henry Bolingbroke
(1367–1413)
(7th) Earl of Leicester, Duke of Lancaster
King Henry IV		John Beaufort
(c. 1373–1410)
Marquess of Somerset, Marquess of Dorset, 1st Earl of Somerset		Thomas Beaufort
(c. 1377–1426)
Duke of Exeter, Earl of Dorset		Joan Beaufort
(c. 1379–1440)		Joan La WarrThomas West
(1365–1405)
1st Baron West		Joan de Beauchamp
(1375–1435)
Earldom of Leicester (2nd creation) and Dukedom of Lancaster merged into the Crown, 1399Marquessate of Somerset and Marquessate of Dorset (1st creation) revoked, 1399Earldom of Dorset (2nd creation) extinct, 1426
Duke of Lancaster, 1399Earl of Worcester (3rd creation), 1421
Henry of Monmouth
(1386–1422)
Duke of Lancaster
King Henry V		Reginald West
(1395–1450)
6th Baron De La Warr and 3rd Baron West		Richard Beauchamp
(1394–c. 1422)
Earl of Worcester
Dukedom of Lancaster merged into the Crown, 1413Earldom of Worcester (2nd creation) extinct, 1422
Duke of Somerset (1st creation), 1443Earl of Dorset (3rd creation), 1442
Marquess of Dorset (2nd creation), 1443
Duke of Somerset (2nd creation), 1448
Henry Beaufort
(1401–1418)
2nd Earl of Somerset		John Beaufort
(1404–1444)
3rd Earl of Somerset, 1st Duke of Somerset		Edmund Beaufort
(1406–1455)
2nd Duke of Somerset, 1st Marquess of Dorset, 4th Earl of Somerset, Earl of Dorset		Richard Neville
(1400–1460)
Earl of Salisbury		Richard West
(1430–1476)
7th Baron De La Warr and 4th Baron West		Edward Neville
(d. 1476)
de facto 3rd (de jure 1st) Baron Bergavenny		Elizabeth Beauchamp
(1415–1448)
Dukedom of Somerset (1st creation) extinct, 1444
Claimed titles here are disputedEarl of Worcester (4th creation), 1449
Margaret Beaufort
(1443–1509)		Elizabeth Woodville
(c. 1437–1492)		Henry Beaufort
(1436–1464)
5th Earl of Dorset, 2nd Marquess of Dorset, 3rd Duke of Somerset		Edmund Beaufort
(c. 1438–1471)
6th Earl of Dorset, 3rd Marquess of Dorset, 4th Duke of Somerset		Cecily Neville
(c. 1425–1450)		John Tiptoft
(1427–1470)
1st Earl of Worcester
Earldom of Dorset, Marquessate of Dorset (2nd creation), and Dukedom of Somerset (2nd creation) attained, 1461, but possibly restored (disputed), 1463Earldom of Dorset, Marquessate of Dorset (2nd creation), and Dukedom of Somerset (2nd creation) extinct, 1471Earldom of Worcester (4th creation) attainted, 1470
Thomas West
(c. 1457–1525)
8th Baron De La Warr and 5th Baron West
Marquess of Dorset (3rd creation), 1475Earl of Worcester (5th creation), 1514Earl of Worcester (4th creation) restored, 1471
Margery Wentworth
(c. 1478–1550)		King Henry VII
(1457–1509)		Elizabeth of York
(1466–1503)		Thomas Grey
(1451–1501)
1st Marquess of Dorset		Charles Somerset
(c. 1460–1526)
1st Earl of Worcester		Elizabeth Somerset
(c. 1476–1507)
suo jure 3rd Baroness Herbert		Edward Tiptoft
(c. 1469–1485)
2nd Earl of Worcester		Eleanor West
(b. 1481)		Edward Guildford
(c. 1474–1534)
Earldom of Worcester (4th creation) extinct, 1485
Viscount Beauchamp "of Hache" (1st creation), 1536
Earl of Hertford (2nd creation), 1537
Duke of Somerset (4th creation), 1547		Duke of Somerset (3rd creation), 1499
Edward Seymour
(c. 1500–1552)
1st Duke of Somerset, 1st Earl of Hertford, 1st Viscount Beauchamp		Jane Seymour
(c. 1508–1537)		King Henry VIII
(1491–1547)		Thomas Grey
(1477–1530)
2nd Marquess of Dorset		Henry Somerset
(c. 1495–1548)
2nd Earl of Worcester, 4th Baron Herbert		John Dudley
(1504–1553)
Duke of Northumberland		Jane Guildford
(c. 1508/1509–1555)		Mary Tudor
(1496–1533)
Queen of France
Duchess of Suffolk		Prince Edmund
(1499–1500)
1st Duke of Somerset
Dukedom of Somerset (4th creation), Earldom of Hertford (2nd creation), and Viscountcy Beauchamp (1st creation) forfeit, 1552Dukedom of Somerset (3rd creation) extinct, 1500
Duke of Richmond and Somerset, 1525
King Edward VI
(1537–1553)		Henry Fitzroy
(1519–1536)
1st Duke of Richmond and Somerset		Henry Grey
(1517–1554)
Duke of Suffolk
3rd Marquess of Dorset		Lady Frances Brandon
(1517–1559)
Duchess of Suffolk
Dukedom of Richmond and Somerset extinct, 1536Marquessate of Dorset (3rd creation) attainted and honours forfeit, 1554
Earl of Hertford (3rd creation) reverted, 1559Earl of Leicester (3rd creation), 1564Baron Buckhurst of Buckhurst in the County of Sussex (1st creation), 1567
Earl of Dorset (4th creation), 1604
Edward Seymour
(c. 1528–1593)		Edward Seymour
(1539–1621)
1st Earl of Hertford		Katherine Grey
(1540–1568)		William Somerset
(c. 1526–1589)
3rd Earl of Worcester, 5th Baron Herbert		John Dudley
(c. 1527–1554)
Earl of Warwick		Robert Dudley
(1532–1588)
1st Earl of Leicester		Mary Dudley
(d. 1586)
m. Henry Sidney		Lord Guildford Dudley
(c. 1535–1554)		Lady Jane Grey
(1537–1554)
Disputed Queen of England		Thomas Sackville
(1536–1608)
1st Earl of Dorset, 1st Baron Buckhurst
Earldom of Hertford (3rd creation) forfeit, 1552Earldom of Leicester (3rd creation) extinct, 1588
Earl of Leicester (4th creation), 1618
Edward Seymour
(c. 1563–1613)
1st Baronet		Edward Seymour
(1561–1612)
Viscount Beauchamp		Edward Somerset
(1553–1628)
4th Earl of Worcester, 6th Baron Herbert		Philip Sidney
(1554–1586)		Mary Sidney
(1561–1621)		Robert Sidney
(1563–1626)
1st Earl of Leicester		Robert Sackville
(1561–1609)
2nd Earl of Dorset, 2nd Baron Buckhurst
Marquess of Hertford (1st creation), 1641
Duke of Somerset (4th creation restored), 1660		Baron Seymour of Trowbridge, 1641Viscount Rochester, 1611
Earl of Somerset (3rd creation), 1613		Marquess of Worcester, 1642Viscount Somerset of Cashel, 1626
Edward Seymour
(c. 1580–1659)
2nd Baronet		William Seymour
(1588–1660)
2nd Earl of Hertford, 1st Marquess of Hertford, 3rd Duke of Somerset		Francis Seymour
(c. 1590–1664)
1st Lord Seymour of Trowbridge		Robert Carr
(c. 1587–1645)
Earl of Somerset		Henry Somerset
(1577–1646)
1st Marquess of Worcester, 5th Earl of Worcester, 7th Baron Herbert		Thomas Somerset
(1579–1651)
Viscount Somerset		Robert Sidney
(1595–1677)
2nd Earl of Leicester		Richard Sackville
(1589–1624)
3rd Earl of Dorset, 3rd Baron Buckhurst		Edward Sackville
(1591–1652)
4th Earl of Dorset, 4th Baron Buckhurst
Earldom of Somerset (3rd creation) and Viscountcy Rochester extinct, 1645Viscountcy Somerset extinct, 1651
Edward Seymour
(1610–1688)
3rd Baronet		Henry Seymour
(c. 1626–1654)
Lord Beauchamp		Charles Seymour
(c. 1621–1665)
2nd Lord Seymour of Trowbridge		Edward Somerset
(1601–1667)
2nd Marquess of Worcester, 6th Earl of Worcester, 8th Baron Herbert		Philip Sidney
(1619–1698)
3rd Earl of Leicester		Algernon Sidney
(1623–1683)		Lady Lucy Sidney
(1630–1685)		Henry Sidney
(1641–1704)
Earl of Romney		Richard Sackville
(1522–1677)
5th Earl of Dorset, 5th Baron Buckhurst
Duke of Beaufort, 1682Baron Cranfield, of Cranfield in the County of Middlesex, 1674
Earl of Middlesex (2nd creation), 1675
Edward Seymour
(1633–1708)
4th Baronet		William Seymour
(1650–1671)
3rd Duke of Somerset, 2nd Marquess of Hertford, 3rd Earl of Hertford		John Seymour
(c. 1646–1675)
4th Duke of Somerset, 3rd Marquess of Hertford, 4th Earl of Hertford		Francis Seymour
(1658–1678)
5th Duke of Somerset, 3rd Lord Seymour of Trowbridge		Charles Seymour
(1662–1748)
6th Duke of Somerset		Henry Somerset
(1629–1700)
1st Duke of Beaufort, 3rd Marquess of Worcester, 7th Earl of Worcester, 9th Baron Herbert		Robert Sidney
(1649–1702)
4th Earl of Leicester		Thomas Pelham
(1653–1712)		Charles Sackville
(1522–1677)
6th Earl of Dorset, 1st Earl of Middlesex, 6th Baron Buckhurst, 1st Baron Cranfield
Marquessate of Hertford (1st creation) extinct, 1675
Baron Conway of Ragley in the County of Warwick, 1703
Baron Conway of Killultagh in the County of Antrim, 1712		Duke of Dorset, 1720
Edward Seymour
(1663–1740)
5th Baronet		Francis Seymour-Conway
(1679–1732)
1st Baron Conway		Edward Coke
(d. 1707)		Algernon Seymour
(1684–1750)
7th Duke of Somerset, Earl of Northumberland		Charles Somerset
(1660–1698)
styled Marquess of Worcester		Philip Sidney
(1676–1705)
5th Earl of Leicester		John Sidney
(1680–1737)
6th Earl of Leicester		Jocelyn Sidney
(1682–1743)
7th Earl of Leicester		Elizabeth Pelham
(1681–1711)		Lionel Sackville
(1688–1765)
1st Duke of Dorset, 7th Earl of Dorset, 2nd Earl of Middlesex, 7th Baron Buckhurst, 2nd Baron Cranfield
Earldom of Leicester (4th creation) extinct, 1743
Baron Lovel, of Minster Lovel in the County of Oxford, 1728
Earl of Leicester (5th creation) and Viscount Coke of Holkham in the County of Norfolk, 1744
Edward Seymour
(1695–1757)
6th Baronet
8th Duke of Somerset		Anne CokeThomas Coke
(1697–1759)
Earl of Leicester, Viscount Coke		Henry Somerset
(1684–1714)
2nd Duke of Beaufort, 4th Marquess of Worcester, 8th Earl of Worcester, 10th Baron Herbert		Charles Townshend
(1700–1764)
3rd Viscount Townshend
Earl of Hertford (4th creation) and Viscount Beauchamp (2nd creation), 1850
Marquess of Hertford (2nd creation), 1793		Earldom of Leicester (5th creation) extinct, 1759Viscount Sackville and Baron Bolebrooke in the County of Sussex, 1782
Edward Seymour
(1717–1792)
9th Duke of Somerset		Webb Seymour
(1718–1793)
10th Duke of Somerset		Francis Seymour
(1726–1799)		Francis Seymour-Conway
(1718–1794)
1st Marquess of Hertford, 1st Earl of Hertford, 1st Viscount Beauchamp, 2nd Baron Conway		Wenman (Roberts) Coke
(c. 1717–1776)		Henry Somerset-Scudamore
(1707–1745)
3rd Duke of Beaufort, 5th Marquess of Worcester, 9th Earl of Worcester, 11th Baron Herbert		Charles Noel Somerset
(1709–1756)
4th Duke of Beaufort, 6th Marquess of Worcester, 10th Earl of Worcester, 12th Baron Herbert		George Townshend
(1724–1807)
1st Marquess Townshend		Charles Sackville
(1711–1769)
2nd Duke of Dorset, 8th Earl of Dorset, 3rd Earl of Middlesex, 8th Baron Buckhurst, 3rd Baron Cranfield		John Sackville
(1713–1765)		George Germain
(1716–1785)
1st Viscount Sackville, 1st Baron Bolebrooke
Earl of Leicester (7th creation), 1837Baron Botetourt abeyance terminated, 1803Earl of Leicester (6th creation), 1784
Francis Compton Seymour
(d. 1822)		Francis Ingram-Seymour-Conway
(1743–1822)
2nd Marquess of Hertford, 2nd Earl of Hertford, 2nd Viscount Beauchamp, 3rd Baron Conway		Hugh Seymour
(1759–1801)		Thomas William Coke
(1754–1842)
1st Earl of Leicester, 1st Viscount Coke		Henry Somerset
(1744–1803)
5th Duke of Beaufort, 7th Marquess of Worcester, 11th Earl of Worcester, 13th Baron Herbert, 5th Baron Botetourt		George Townshend
(1753–1811)
2nd Marquess Townshend, 1st Earl of Leicester		John Frederick Sackville
(1745–1799)
3rd Duke of Dorset, 9th Earl of Dorset, 4th Earl of Middlesex, 9th Baron Buckhurst, 4th Baron Cranfield
Baron Raglan, 1852
Edward Adolphus St Maur
(1775–1855)
11th Duke of Somerset		Francis Charles Seymour-Conway
(1777–1842)
3rd Marquess of Hertford, 3rd Earl of Hertford, 3rd Viscount Beauchamp, 4th Baron Conway		George Seymour
(1787–1870)		Henry Charles Somerset
(1766–1835)
6th Duke of Beaufort, 8th Marquess of Worcester, 12th Earl of Worcester, 14th Baron Herbert, 6th Baron Botetourt		FitzRoy James Henry Somerset
(1788–1855)
1st Baron Raglan		George Townshend
(1778–1855)
3rd Marquess Townshend, 2nd Earl of Leicester		George John Frederick Sackville
(1793–1815)
4th Duke of Dorset, 10th Earl of Dorset, 5th Earl of Middlesex, 10th Baron Buckhurst, 5th Baron Cranfield		John Frederick Sackville
(1767–1843)
5th Duke of Dorset, 11th Earl of Dorset, 6th Earl of Middlesex, 2nd Viscount Sackville, 11th Baron Buckhurst, 6th Baron Cranfield, 2nd Baron Bolebrooke
Earldom of Leicester (6th creation) extinct, 1855Dukedom of Dorset, Earldoms of Dorset (4th creation) and Middlesex (2nd creation), Viscountcy of Sackville, Baronies of Buckhurst (1st creation), Cranfield, and Bolebrooke extinct, 1843
Francis Edward Seymour
(1788–1866)		Richard Seymour-Conway
(1800–1870)
4th Marquess of Hertford, 4th Earl of Hertford, 4th Viscount Beauchamp, 5th Baron Conway		Francis George Hugh Seymour
(1812–1884)
5th Marquess of Hertford, 5th Earl of Hertford, 5th Viscount Beauchamp, 6th Baron Conway		Henry Somerset
(1792–1853)
7th Duke of Beaufort, 9th Marquess of Worcester, 13th Earl of Worcester, 15th Baron Herbert, 8th Baron Botetourt
Earl St. Maur, 1863
Edward Adolphus St Maur
(1804–1885)
12th Duke of Somerset		Archibald Henry Algernon St Maur
(1810–1891)
13th Duke of Somerset		Algernon Percy Banks St Maur
(1813–1894)
14th Duke of Somerset		Francis Payne Seymour
(1815–1870)		Thomas William Coke
(1822–1909)
2nd Earl of Leicester, 2nd Viscount Coke		Henry Charles FitzRoy Somerset
(1824–1899)
8th Duke of Beaufort, 10th Marquess of Worcester, 14th Earl of Worcester, 16th Baron Herbert, 8th Baron Botetourt		Richard Henry FitzRoy Somerset
(1817–1884)
2nd Baron Raglan
Earldom St. Maur extinct, 1885
Edward Adolphus Ferdinand St. Maur
(1835–1869)		Algernon St Maur
(1846–1923)
15th Duke of Somerset		Edward Hamilton Seymour
(1860–1931)
16th Duke of Somerset		Hugh de Grey Seymour
(1843–1912)
6th Marquess of Hertford, 6th Earl of Hertford, 6th Viscount Beauchamp, 7th Baron Conway		Thomas William Coke
(1848–1941)
3rd Earl of Leicester, 3rd Viscount Coke		Henry Adelbert Wellington FitzRoy Somerset
(1847–1924)
9th Duke of Beaufort, 11th Marquess of Worcester, 15th Earl of Worcester, 17th Baron Herbert, 9th Baron Botetourt		Henry Richard Charles Somerset
(1849–1932)		George FitzRoy Henry Somerset
(1857–1921)
3rd Baron Raglan
Evelyn Francis Edward Seymour
(1882–1954)
17th Duke of Somerset		George Francis Alexander Seymour
(1871–1940)
7th Marquess of Hertford, 7th Earl of Hertford, 7th Viscount Beauchamp, 8th Baron Conway		Henry Charles Seymour
(1878–1939)		Thomas William Coke
(1880–1949)
4th Earl of Leicester, 4th Viscount Coke		Arthur George Coke
(1882–1915)		Henry Charles Somers Augustus Somerset
(1874–1945)		FitzRoy Richard Somerset
(1885–1964)
4th Baron Raglan
Percy Hamilton Seymour
(1910–1984)
18th Duke of Somerset		Thomas William Edward Coke
(1908–1976)
5th Earl of Leicester, 5th Viscount Coke		Anthony Louis Lovel Coke
(1909–1994)
6th Earl of Leicester, 6th Viscount Coke		Henry Hugh Arthur FitzRoy Somerset
(1900–1984)
10th Duke of Beaufort, 12th Marquess of Worcester, 16th Earl of Worcester, 18th Baron Herbert, 10th Baron Botetourt		Henry Robert Somers FitzRoy de Vere Somerset
(1898–1965)
Barony Botetourt abeyant, 1984
Hugh Edward Conway Seymour
(1930–1997)
8th Marquess of Hertford, 8th Earl of Hertford, 8th Viscount Beauchamp, 9th Baron Conway		Edward Douglas Coke
(1936–2015)
7th Earl of Leicester, 7th Viscount Coke		David Robert Somerset
(1928–2017)
11th Duke of Beaufort, 13th Marquess of Worcester, 17th Earl of Worcester		FitzRoy John Somerset
(1927–2010)
5th Baron Raglan		Geoffrey Somerset
(b. 1932)
6th Baron Raglan
John Michael Edward Seymour
(b. 1952)
19th Duke of Somerset		Henry (Harry) Jocelyn Seymour
(b. 1958)
9th Marquess of Hertford, 9th Earl of Hertford, 9th Viscount Beauchamp, 10th Baron Conway		Thomas Edward Coke
(b. 1965)
8th Earl of Leicester, 8th Viscount Coke		Henry John FitzRoy Somerset
(b. 1952)
12th Duke of Beaufort, 14th Marquess of Worcester, 18th Earl of Worcester		Arthur Geoffrey Somerset (1960–2012)
Sebastian Edward Seymour
(b. 1982)
styled Lord Seymour		William Francis Seymour
(b. 1993)
styled Earl of Yarmouth		Edward Horatio Coke
(b. 2003)
styled Viscount Coke		Henry Robert FitzRoy Somerset
(b. 1989)
styled Marquess of Worcester		Inigo Arthur Fitzroy Somerset
(b. 2004)
Heir apparent to the Dukedom of SomersetHeir apparent to the Marquessage of HertfordHeir apparent to the Earldom of LeicesterHeir apparent to the Dukedom of BeaufortHeir apparent to the Raglan Barony

See also

Category