| | | | | | | | | | | | 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 | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | | | 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 |
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| | | | | | | | | | | | | | | | | | 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 | |
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| | | | | | | | | | | | | | | | | Earldom of Worcester (1st creation) extinct, 1166 | | | | | |
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| | | | | | | | William FitzRobert (1116–1183) 2nd Earl of Gloucester | | | | | | Hawise de Beaumont | | Robert de Beaumont (d. 1190) 3rd Earl of Leicester |
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| | | | | | | | | | | | | | | | | | | | | Robert de Beaumont (d. 1204) 4th Earl of Leicester | | Amice Countess of Rochefort |
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| | | | | | | | King John (1166–1216) | | Isabella (1173/1174–1217) Countess of Gloucester | | | | | | | | | | Simon de Montfort (c. 1175–1218) 5th Earl of Leicester |
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| | | | | | | | King Henry III (1207–1272) | | | | | | | | | | Eleanor of England | | Simon de Montfort (c. 1208–1265) 6th Earl of Leicester |
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| | | | | | | | | | | | | | | | | | | | | | | | | | Earldom of Leicester (1st creation) forfeited, 1265 |
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| | | | | | | | | | | | | | | | | 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 |
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| | | | | | | | | | | | | | | | | | | | | | 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 | | | | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | | | | 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) |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Earl of Worcester (2nd creation), 1397 |
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| | | | | | | | 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 | |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Earldom of Worcester (2nd creation) extinct, 1403 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | Roger La Warr (1326–1370) | | Eleanor Mowbray | | | | | |
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| | | | | | | | | | | | | | Earl of Somerset (1st creation), 1397 Marquess of Somerset and Marquess of Dorset (1st creation), 1397 | | Earl of Dorset (2nd creation), 1411 | | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | 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 Warr | | Thomas West (1365–1405) 1st Baron West | | Joan de Beauchamp (1375–1435) |
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| | | | | | | | Earldom of Leicester (2nd creation) and Dukedom of Lancaster merged into the Crown, 1399 | | Marquessate of Somerset and Marquessate of Dorset (1st creation) revoked, 1399 | | Earldom of Dorset (2nd creation) extinct, 1426 | | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | Duke of Lancaster, 1399 | | | | | | | | | | | | | | | | | | | | | | | | | Earl 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, 1413 | | | | | | | | | | | | | | | | | | | | | | | | | Earldom of Worcester (2nd creation) extinct, 1422 |
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| | | | | Duke of Somerset (1st creation), 1443 | | | | | | Earl 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) |
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| | | | Dukedom of Somerset (1st creation) extinct, 1444 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | Claimed titles here are disputed | | | | | | | Earl 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 | | | | | |
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| | | | | | | | | | | | | | Earldom of Dorset, Marquessate of Dorset (2nd creation), and Dukedom of Somerset (2nd creation) attained, 1461, but possibly restored (disputed), 1463 | | Earldom of Dorset, Marquessate of Dorset (2nd creation), and Dukedom of Somerset (2nd creation) extinct, 1471 | | | | | | Earldom of Worcester (4th creation) attainted, 1470 | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Thomas West (c. 1457–1525) 8th Baron De La Warr and 5th Baron West |
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| | | | | | | | | | | | | | Marquess of Dorset (3rd creation), 1475 | | Earl of Worcester (5th creation), 1514 | | | | | | Earl 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) |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Earldom of Worcester (4th creation) extinct, 1485 | | | | | | | |
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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 |
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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 |
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Dukedom of Somerset (4th creation), Earldom of Hertford (2nd creation), and Viscountcy Beauchamp (1st creation) forfeit, 1552 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Dukedom of Somerset (3rd creation) extinct, 1500 |
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| | | | | | | | | | 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 |
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| | | | | | | | | | Dukedom of Richmond and Somerset extinct, 1536 | | | | | | | | | | | | | | | | Marquessate of Dorset (3rd creation) attainted and honours forfeit, 1554 | | | |
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| | | | | Earl of Hertford (3rd creation) reverted, 1559 | | | | | | | | | | | | | | | | | | | | | Earl of Leicester (3rd creation), 1564 | | | | | | | | | | | | | | | | | Baron 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 |
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| | | | | Earldom of Hertford (3rd creation) forfeit, 1552 | | | | | | | | | | | | | | | | | | | | Earldom of Leicester (3rd creation) extinct, 1588 | | | | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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 |
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| | | | | Marquess of Hertford (1st creation), 1641 Duke of Somerset (4th creation restored), 1660 | | Baron Seymour of Trowbridge, 1641 | | Viscount Rochester, 1611 Earl of Somerset (3rd creation), 1613 | | Marquess of Worcester, 1642 | | Viscount 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, 1645 | | | | | | | Viscountcy Somerset extinct, 1651 | | | | | | | | | | | | | | | | | | | | | | | | |
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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 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | Duke of Beaufort, 1682 | | | | | | | | | | | | | | | | | | | | | Baron Cranfield, of Cranfield in the County of Middlesex, 1674 Earl of Middlesex (2nd creation), 1675 |
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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 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| | | | | 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 | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | 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 Coke | | Thomas 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 | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | Earl of Hertford (4th creation) and Viscount Beauchamp (2nd creation), 1850 Marquess of Hertford (2nd creation), 1793 | | | | | | | Earldom of Leicester (5th creation) extinct, 1759 | | | | | | | | | | | | | | | | | | | | | | | | | | | Viscount Sackville and Baron Bolebrooke in the County of Sussex, 1782 |
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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 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | Earl of Leicester (7th creation), 1837 | | | | | | Baron Botetourt abeyance terminated, 1803 | | Earl of Leicester (6th creation), 1784 | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | 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 | | | | | |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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, 1855 | | | | | | | | | | Dukedom 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 | | | | | |
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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 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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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 |
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| | | | | | | | 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 |
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| | | | | | | | 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 | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | 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 |
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| | | | | | | | 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) | |
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| | | | | | | | 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 Somerset | | | | | | Heir apparent to the Marquessage of Hertford | | | | | | Heir apparent to the Earldom of Leicester | | | | | | Heir apparent to the Dukedom of Beaufort | | | | | | Heir apparent to the Raglan Barony |