| | | | | | | | | | | | Earl of Dorset (possible 1st creation), 1070 |
| | | | | | | | | | | | Saint Osmund d. 1099 Bishop of Salisbury and possible Earl of Dorset | | | | | | Roger de Beaumont c. 1015โ1094 |
| | | | | | | | | | | | Earl of Dorset (1st creation) discontinued, 1099 | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | | | Earl of Leicester (1st creation), 1107 | | | | | |
| | | | | | | | King Henry I c. 1068โ1135 | | King Stephen 1092/1096โ1154 | | | | | | Robert de Beaumont c. 1040/1050โ1118 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. 1090โ1147 1st Earl of Gloucester | | Matilda (d. bef. 1141) | | Waleran de Beaumont 1104โ1166 Earl of Worcester | | Robert de Beaumont 1104โ1168 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 1116โ1183 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 1166โ1216 | | Isabella 1173/1174โ1217 Countess of Gloucester | | | | | | | | | | Simon de Montfort c. 1175โ1218 5th Earl of Leicester |
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| | | | | | | | King Henry III 1207โ1272 | | | | | | | | | | Eleanor of England | | Simon de Montfort c. 1208โ1265 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 1239โ1307 | | Edmund Crouchback 1245โ1296 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 1284โ1327 | | Thomas of Lancaster 1278โ1322 2nd Earl of Leicester, 2nd Earl of Lancaster | | | | | | Henry of Lancaster 1281โ1345 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 1312โ1377 | | | | | | Henry of Grosmont c. 1310โ1361 Duke of Lancaster, 4th Earl of Lancaster, 4th Earl of Leicester | | | | | | Joan of Lancaster c. 1312โ1349 | | John (II) de Mowbray 1310โ1361 3rd Baron Mowbray | | Eleanor of Lancaster 1318โ1372 | | Mary of Lancaster c. 1320โ1362 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Earl of Worcester (2nd creation), 1397 |
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| | | | | | | | John of Gaunt 1340โ1399 Duke of Lancaster, 5th Earl of Lancaster, (6th) Earl of Leicester jure uxoris | | Blanche of Lancaster 1342โ1368 | | | | | | Maud of Lancaster 1340โ1362 a.k.a. Matilda, Countess of Hainault | | William 1330โ1389 Duke of Bavaria and Count of Holland, (5th) Earl of Leicester jure uxoris | | | | | | | Richard Fitzalan 1346โ1397 Earl of Arundel | | Thomas Percy 1343โ1403 Earl of Worcester | |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Earldom of Worcester (2nd creation) extinct, 1403 |
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| | | | | | | | | | | | | | | | | | | | | | | | | | | | Roger La Warr 1326โ1370 | | 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 1367โ1413 Duke of Lancaster, (7th) Earl of Leicester King Henry IV | | John Beaufort c. 1373โ1410 Marquess of Somerset, Marquess of Dorset, 1st Earl of Somerset | | Thomas Beaufort c. 1377โ1426 Duke of Exeter, Earl of Dorset | | Joan Beaufort c. 1379โ1440 | | Joan La Warr | | Thomas West 1365โ1405 1st Baron West | | Joan de Beauchamp 1375โ1435 |
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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 1386โ1422 Duke of Lancaster King Henry V | | | | | | | | | | | | | | | | Reginald West 1395โ1450 6th Baron De La Warr and 3rd Baron West | | | | | | Richard Beauchamp (1394โc. 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 1401โ1418 2nd Earl of Somerset | | John Beaufort 1404โ1444 1st Duke of Somerset, 3rd Earl of Somerset | | | | | | Edmund Beaufort 1406โ1455 2nd Duke of Somerset, 1st Marquess of Dorset, 4th Earl of Somerset, Earl of Dorset | | | | | | Richard Neville 1400โ1460 Earl of Salisbury | | Richard West 1430โ1476 7th Baron De La Warr and 4th Baron West | | Edward Neville d. 1476 de facto 3rd (de jure 1st) Baron Bergavenny | | Elizabeth Beauchamp 1415โ1448 |
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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 1443โ1509 | | Elizabeth Woodville c. 1437โ1492 | | Henry Beaufort 1436โ1464 3rd Duke of Somerset, 2nd Marquess of Dorset, 5th Earl of Dorset | | Edmund Beaufort c. 1438โ1471 4th Duke of Somerset, 3rd Marquess of Dorset, 6th Earl of Dorset | | Cecily Neville c. 1425โ1450 | | John Tiptoft 1427โ1470 1st Earl of Worcester | | | | | |
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| | | | | | | | | | | | | | Dukedom of Somerset (2nd creation), Marquessate of Dorset (2nd creation), and Earldom of Dorset attained, 1461, but possibly restored (disputed), 1463 | | Dukedom of Somerset (2nd creation), Marquessate of Dorset (2nd creation), and Earldom of Dorset extinct, 1471 | | | | | | Earldom of Worcester (4th creation) attainted, 1470 | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Thomas West c. 1457โ1525 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. 1478โ1550 | | King Henry VII 1457โ1509 | | Elizabeth of York 1466โ1503 | | Thomas Grey 1451โ1501 1st Marquess of Dorset | | Charles Somerset c. 1460โ1526 1st Earl of Worcester | | Elizabeth Somerset c. 1476โ1507 3rd Baroness Herbert suo jure | | Edward Tiptoft c. 1469โ1485 2nd Earl of Worcester | | Eleanor West b. 1481 | | Edward Guildford c. 1474โ1534 |
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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. 1500โ1552 1st Duke of Somerset, 1st Earl of Hertford and Viscount Beauchamp | | Jane Seymour c. 1508โ1537 | | King Henry VIII 1491โ1547 | | Thomas Grey 1477โ1530 2nd Marquess of Dorset | | Henry Somerset c. 1495โ1548 2nd Earl of Worcester, 4th Baron Herbert | | John Dudley 1504โ1553 Duke of Northumberland | | Jane Guildford c. 1508/1509โ1555 | | Mary Tudor 1496โ1533 Queen of France Duchess of Suffolk | | Prince Edmund 1499โ1500 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 1537โ1553 | | Henry Fitzroy 1519โ1536 1st Duke of Richmond and Somerset | | | | | | | | | | | | | | | | Henry Grey 1517โ1554 Duke of Suffolk 3rd Marquess of Dorset | | Lady Frances Brandon 1517โ1559 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. 1528โ1593 | | Edward Seymour 1539โ1621 1st Earl of Hertford | | | | | | Katherine Grey 1540โ1568 | | William Somerset c. 1526โ1589 3rd Earl of Worcester, 5th Baron Herbert | | John Dudley c. 1527โ1554 Earl of Warwick | | Robert Dudley 1532โ1588 1st Earl of Leicester | | Mary Dudley d. 1586 m. Henry Sidney | | Lord Guildford Dudley c. 1535โ1554 | | Lady Jane Grey 1537โ1554 Disputed Queen of England | | Thomas Sackville 1536โ1608 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. 1563โ1613 1st Baronet | | | | | | Edward Seymour 1561โ1612 Viscount Beauchamp | | | | | | Edward Somerset 1553โ1628 4th Earl of Worcester, 6th Baron Herbert | | | | | | Philip Sidney 1554โ1586 | | Mary Sidney 1561โ1621 | | Robert Sidney 1563โ1626 1st Earl of Leicester | | | | | | Robert Sackville 1561โ1609 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. 1580โ1659 2nd Baronet | | William Seymour 1588โ1660 3rd Duke of Somerset, 1st Marquess of Hertford, 2nd Earl of Hertford | | Francis Seymour c. 1590โ1664 1st Lord Seymour of Trowbridge | | Robert Carr c. 1587โ1645 Earl of Somerset | | Henry Somerset 1577โ1646 1st Marquess of Worcester, 5th Earl of Worcester, 7th Baron Herbert | | Thomas Somerset 1579โ1651 Viscount Somerset | | | | | | | | | | Robert Sidney 1595โ1677 2nd Earl of Leicester | | Richard Sackville 1589โ1624 3rd Earl of Dorset, 3rd Baron Buckhurst | | Edward Sackville 1591โ1652 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 1610โ1688 3rd Baronet | | Henry Seymour c. 1626โ1654 Lord Beauchamp | | | Charles Seymour c. 1621โ1665 2nd Lord Seymour of Trowbridge | | | | | | Edward Somerset 1601โ1667 2nd Marquess of Worcester, 6th Earl of Worcester, 8th Baron Herbert | | | | | | Philip Sidney 1619โ1698 3rd Earl of Leicester | | Algernon Sidney 1623โ1683 | | Lady Lucy Sidney 1630โ1685 | | Henry Sidney 1641โ1704 Earl of Romney | | Richard Sackville 1522โ1677 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 1633โ1708 4th Baronet | | William Seymour 1650โ1671 3rd Duke of Somerset, 2nd Marquess of Hertford, 3rd Earl of Hertford | | John Seymour c. 1646โ1675 4th Duke of Somerset, 3rd Marquess of Hertford, 4th Earl of Hertford | | Francis Seymour 1658โ1678 5th Duke of Somerset, 3rd Lord Seymour of Trowbridge | | Charles Seymour 1662โ1748 6th Duke of Somerset | | Henry Somerset 1629โ1700 1st Duke of Beaufort, 3rd Marquess of Worcester, 7th Earl of Worcester, 9th Baron Herbert | | Robert Sidney 1649โ1702 4th Earl of Leicester | | | | | | | | | | Thomas Pelham 1653โ1712 | | Charles Sackville 1522โ1677 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 1663โ1740 5th Baronet | | Francis Seymour-Conway 1679โ1732 1st Baron Conway | | | | | | Edward Coke d. 1707 | | Algernon Seymour 1684โ1750 7th Duke of Somerset, Earl of Northumberland | | Charles Somerset 1660โ1698 styled Marquess of Worcester | | Philip Sidney 1676โ1705 5th Earl of Leicester | | John Sidney 1680โ1737 6th Earl of Leicester | | Jocelyn Sidney 1682โ1743 7th Earl of Leicester | | Elizabeth Pelham 1681โ1711 | | Lionel Sackville 1688โ1765 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 1695โ1757 6th Baronet 8th Duke of Somerset | | | | | | | | | | | | | | | | | | | | Anne Coke | | Thomas Coke 1697โ1759 Earl of Leicester, Viscount Coke | | Henry Somerset 1684โ1714 2nd Duke of Beaufort, 4th Marquess of Worcester, 8th Earl of Worcester, 10th Baron Herbert | | | | | | Charles Townshend 1700โ1764 3rd Viscount Townshend | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | Earl of Hertford (4th creation) and Viscount Beauchamp (2nd creation), 1850 Marquess of Hertford (2nd creation) and Earl of Yarmouth (3rd 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 1717โ1792 9th Duke of Somerset | | Webb Seymour 1718โ1793 10th Duke of Somerset | | | | | | Francis Seymour 1726โ1799 | | Francis Seymour-Conway 1718โ1794 1st Marquess of Hertford, Earl of Hertford, Earl of Yarmouth, and Viscount Beauchamp, 2nd Baron Conway | | Wenman (Roberts) Coke c. 1717โ1776 | | | | | | Henry Somerset-Scudamore 1707โ1745 3rd Duke of Beaufort, 5th Marquess of Worcester, 9th Earl of Worcester, 11th Baron Herbert | | Charles Noel Somerset 1709โ1756 4th Duke of Beaufort, 6th Marquess of Worcester, 10th Earl of Worcester, 12th Baron Herbert | | George Townshend 1724โ1807 1st Marquess Townshend | | Charles Sackville 1711โ1769 2nd Duke of Dorset, 8th Earl of Dorset, 3rd Earl of Middlesex, 8th Baron Buckhurst, 3rd Baron Cranfield | | John Sackville 1713โ1765 | | George Germain 1716โ1785 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 1743โ1822 2nd Marquess of Hertford, Earl of Hertford, Earl of Yarmouth, and Viscount Beauchamp, 3rd Baron Conway | | Hugh Seymour 1759โ1801 | | Thomas William Coke 1754โ1842 1st Earl of Leicester, 1st Viscount Coke | | | | | | Henry Somerset 1744โ1803 5th Duke of Beaufort, 7th Marquess of Worcester, 11th Earl of Worcester, 13th Baron Herbert, 5th Baron Botetourt | | George Townshend 1753โ1811 2nd Marquess Townshend, 1st Earl of Leicester | | | | | | John Frederick Sackville 1745โ1799 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 1775โ1855 11th Duke of Somerset | | | | | | | | | | | Francis Charles Seymour-Conway 1777โ1842 3rd Marquess of Hertford, Earl of Hertford, Earl of Yarmouth, and Viscount Beauchamp, 4th Baron Conway | | George Seymour 1787โ1870 | | | | | | | Henry Charles Somerset 1766โ1835 6th Duke of Beaufort, 8th Marquess of Worcester, 12th Earl of Worcester, 14th Baron Herbert, 6th Baron Botetourt | | FitzRoy James Henry Somerset 1788โ1855 1st Baron Raglan | | George Townshend 1778โ1855 3rd Marquess Townshend, 2nd Earl of Leicester | | | | | | George John Frederick Sackville 1793โ1815 4th Duke of Dorset, 10th Earl of Dorset, 5th Earl of Middlesex, 10th Baron Buckhurst, 5th Baron Cranfield | | John Frederick Sackville 1767โ1843 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 1788โ1866 | | Richard Seymour-Conway 1800โ1870 4th Marquess of Hertford, Earl of Hertford, Earl of Yarmouth, and Viscount Beauchamp, 5th Baron Conway | | Francis George Hugh Seymour 1812โ1884 5th Marquess of Hertford, Earl of Hertford, Earl of Yarmouth, and Viscount Beauchamp, 6th Baron Conway | | | | | | | Henry Somerset 1792โ1853 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 1804โ1885 12th Duke of Somerset | | Archibald Henry Algernon St Maur 1810โ1891 13th Duke of Somerset | | Algernon Percy Banks St Maur 1813โ1894 14th Duke of Somerset | | Francis Payne Seymour 1815โ1870 | | | | | | | | | | | Thomas William Coke 1822โ1909 2nd Earl of Leicester, 2nd Viscount Coke | | Henry Charles FitzRoy Somerset 1824โ1899 8th Duke of Beaufort, 10th Marquess of Worcester, 14th Earl of Worcester, 16th Baron Herbert, 8th Baron Botetourt | | | | | | Richard Henry FitzRoy Somerset 1817โ1884 2nd Baron Raglan |
Earldom St. Maur extinct, 1885 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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Edward Adolphus Ferdinand St. Maur 1835โ1869 | | | | | | Algernon St Maur 1846โ1923 15th Duke of Somerset | | Edward Hamilton Seymour 1860โ1931 16th Duke of Somerset | | Hugh de Grey Seymour 1843โ1912 6th Marquess of Hertford, Earl of Hertford, Earl of Yarmouth, and Viscount Beauchamp, 7th Baron Conway | | | | | | Thomas William Coke 1848โ1941 3rd Earl of Leicester, 3rd Viscount Coke | | Henry Adelbert Wellington FitzRoy Somerset 1847โ1924 9th Duke of Beaufort, 11th Marquess of Worcester, 15th Earl of Worcester, 17th Baron Herbert, 9th Baron Botetourt | | Henry Richard Charles Somerset 1849โ1932 | | George FitzRoy Henry Somerset 1857โ1921 3rd Baron Raglan |
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| | | | | | | | Evelyn Francis Edward Seymour 1882โ1954 17th Duke of Somerset | | George Francis Alexander Seymour 1871โ1940 7th Marquess of Hertford, Earl of Hertford, Earl of Yarmouth, and Viscount Beauchamp, 8th Baron Conway | | Henry Charles Seymour 1878โ1939 | | Thomas William Coke 1880โ1949 4th Earl of Leicester, 4th Viscount Coke | | Arthur George Coke 1882โ1915 | | | | | | | Henry Charles Somers Augustus Somerset 1874โ1945 | | FitzRoy Richard Somerset 1885โ1964 4th Baron Raglan |
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| | | | | | | | Percy Hamilton Seymour 1910โ1984 18th Duke of Somerset | | | | | | | | | | | Thomas William Edward Coke 1908โ1976 5th Earl of Leicester, 5th Viscount Coke | | Anthony Louis Lovel Coke 1909โ1994 6th Earl of Leicester, 6th Viscount Coke | | Henry Hugh Arthur FitzRoy Somerset 1900โ1984 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 1898โ1965 | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Barony Botetourt abeyant, 1984 | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | Hugh Edward Conway Seymour 1930โ1997 8th Marquess of Hertford, Earl of Hertford, Earl of Yarmouth, and Viscount Beauchamp, 9th Baron Conway | | | | | | Edward Douglas Coke 1936โ2015 7th Earl of Leicester, 7th Viscount Coke | | | | | | David Robert Somerset 1928โ2017 11th Duke of Beaufort, 13th Marquess of Worcester, 17th Earl of Worcester | | FitzRoy John Somerset 1927โ2010 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, Earl of Hertford, Earl of Yarmouth, and 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 1960โ2012 | |
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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 |