|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 | 
|  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 Beaumont |  | Robert 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 England |  | Simon 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 (2nd 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 (2nd creation) and Earldom of Lancaster forfeited, 1322 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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
 | 
|  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Earl of Worcester  (2nd creation), 1397 | 
|  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  | John of Gaunt 1340–1399
 Duke of Lancaster, 5th Earl of Lancaster, (6th) Earl of Leicesterjure uxoris
 Earl of Richmond
 |  | Blanche of Lancaster 1342–1368
 5th Countess of Lancaster, (6th) Countess of Leicester
 |  |  |  |  |  | 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 Leicesterjure 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
 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|
|  |  |  |  |  |  |  |  | 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 | 
|
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  | 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
 | 
|  | 
|  |  |  |  | Dukedom of Somerset (1st creation) extinct, 1444 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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
 |  |  |  |  |  | 
|  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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
 | 
|  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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
 | 
|  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 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 | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  | 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, 1536 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Marquessate of Dorset (3rd creation) attainted and honours forfeit, 1554 |  |  |  | 
|  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  | 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
 | 
|  |  |  |  |  |  |  | 
|  |  |  |  |  | Earldom of Hertford (3rd creation) forfeit, 1552 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Earldom 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, 1641 |  |  |  |  |  | Marquess of Worcester , 1642 |  | Viscount Somerset of Cashel, 1626 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Viscount Rochester, 1611 Earl of Somerset  (3rd creation), 1613
 | 
|
| 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
 |  |  |  |  |  | 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
 |  |  |  |  |  | Robert Carr c. 1587–1645
 Earl of Somerset, Viscount Rochester
 | 
|
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Viscountcy Somerset extinct, 1651 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Earldom of Somerset (3rd creation) and Viscountcy Rochester extinct, 1645 | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 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 , 1682 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Baron Cranfield, of Cranfield, 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, 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Baron Lovel, 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, and Baron Lovel
 |  | 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) and  Earl of Yarmouth  (3rd creation), 1793
 |  |  |  |  |  |  | Earldom of Leicester (5th creation) and subsidiary titles extinct, 1759 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Viscount Sackville and Baron Bolebrooke, 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, 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
 | 
|
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Earl of Leicester  (7th creation), 1837 |  |  |  |  |  | Baron Botetourt abeyance terminated, 1803 |  | Earl of Leicester  (6th creation), 1784 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  | 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 and 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, 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
 |  |  |  |  |  | 
|
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
| 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 and 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, Earl of Hertford, Earl of Yarmouth, and Viscount Beauchamp,
 7th Baron Conway
 |  |  |  |  |  | Thomas William Coke 1848–1941
 3rd Earl of Leicester and 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, 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 and 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 and Viscount Coke
 |  | Anthony Louis Lovel Coke 1909–1994
 6th Earl of Leicester and 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, Earl of Hertford, Earl of Yarmouth, and Viscount Beauchamp,
 9th Baron Conway
 |  |  |  |  |  | Edward Douglas Coke 1936–2015
 7th Earl of Leicester and 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 1932–2025
 6th Baron Raglan
 | 
|
|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|
|  |  |  |  |  |  |  |  | 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 and 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 7th Baron Raglan
 b. 2004
 |  | Ivo Geoffrey Arthur Tarsus Somerset b. 2007
 |  | 
|
|  |  |  |  |  |  |  |  | Heir apparent to the Dukedom of Somerset |  |  |  |  |  | Heir apparent to the Marquessate of Hertford |  |  |  |  |  | Heir apparent to the Earldom of Leicester |  |  |  |  |  | Heir apparent to the Dukedom of Beaufort |  |  |  |  |  |  |  |  |  | Heir presumptive to the Raglan Barony |  | 
|