|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Earl of Dorset (possible 1st creation), 1070 | 
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Roger de Beaumont c. 1015–1094 |  |  |  |  |  | Saint Osmund d. 1099 Bishop of Salisbury and possible Earl of Dorset | 
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 Duke of Lancaster, 4th Earl of Lancaster, 4th Earl of Leicester |  |  |  |  |  | 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 Duke of Lancaster, 5th Earl of Lancaster, (6th) Earl of Leicester jure uxoris |  | Blanche of Lancaster 1342–1368 |  |  |  |  |  | Maud of Lancaster 1340–1362 a.k.a. Matilda, Countess of Hainault |  | William 1330–1389 Duke of Bavaria and 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 | 
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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 |  |  |  |  |  |  |  | Henry Bolingbroke 1367–1413 Duke of Lancaster, (7th) Earl of Leicester 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 | 
 |  | 
 |  |  |  |  |  |  |  | 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 1st Duke of Somerset, 3rd Earl 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 3rd Duke of Somerset, 2nd Marquess of Dorset, 5th Earl of Dorset |  | Edmund Beaufort c. 1438–1471 4th Duke of Somerset, 3rd Marquess of Dorset, 6th Earl of Dorset |  | Cecily Neville c. 1425–1450 |  | John Tiptoft 1427–1470 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. 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 3rd Baroness Herbert suo jure |  | 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 and 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, 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) and Viscount Beauchamp "of Hache" (2nd creation), 1559 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Earl of Leicester (3rd creation), 1564 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Baron Buckhurst (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 Duke of Somerset, 1st Marquess of Hertford, 2nd Earl of Hertford |  | 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, 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, 1703 Baron Conway of Killultagh, 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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | , of Minster Lovel, 1728 Earl of Leicester (5th creation) and Viscount Coke, 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) and Earl of Yarmouth (3rd creation), 1793 |  |  |  |  |  |  | Earldom of Leicester (5th creation) extinct, 1759 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Viscount Sackville and Baron Bolebrooke, 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, Earl of Hertford, Earl of Yarmouth, and 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, Earl of Hertford, Earl of Yarmouth, and 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, Earl of Hertford, Earl of Yarmouth, and 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, Earl of Hertford, Earl of Yarmouth, and Viscount Beauchamp, 5th Baron Conway |  | Francis George Hugh Seymour 1812–1884 5th Marquess of Hertford, Earl of Hertford, Earl of Yarmouth, and 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, Earl of Hertford, Earl of Yarmouth, and 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, Earl of Hertford, Earl of Yarmouth, and 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, Earl of Hertford, Earl of Yarmouth, and 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, 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 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 |