| | Godwin (c. 1001–1053) Earl of Wessex |
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Earl of Hereford (1st creation), 1043 | | Earl of Hereford (3rd creation), 1058 | | | | | | | | | | Earl of Hereford (2nd creation), 1052 | | Earl of Hereford (4th creation), 1067 |
Sweyn Godwinson (1020–1052) Earl of Hereford | | Harold Godwinson (c. 1022–1066) Earl of Hereford, King of the English | | William de Mandeville (d. before 1130) | | | | | | Ralph the Timid (d. 1057) Earl of Hereford | | William FitzOsbern (1011–1071) 1st Earl of Hereford |
Earldom of Hereford (1st creation) forfeit, 1051 | | Earldom of Hereford (3rd creation) extinct, 1066 | | | | | | | | | | | | Earldom of Hereford (2nd creation) extinct, 1057 | | | | | |
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| | | | | | | | | | | | | Earl of Essex (1st creation), 1140 | | | | | | | | | | | Earl of Hereford (5th creation), 1141 |
| | | | William de Say I | | Beatrice ("Beatrix") de Say (d. 1197) | | Geoffrey de Mandeville (d. 1144) 1st Earl of Essex | | | | | | Roger de Breteuil (1058– after 1087) 2nd Earl of Hereford | | Miles of Gloucester (d. 1143) 1st Earl of Hereford |
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| | | | | | | | | | | | | | | | | | | | | | Earldom of Hereford (4th creation) forfeit, 1074 | | | | | |
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| | | | William de Say II (d. 1184) | | Geoffrey de Saye I (d. 1214) | | Geoffrey de Mandeville (d. 1166) 2nd Earl of Essex | | William de Mandeville (d. 1189) 3rd Earl of Essex | | Margaret of Hereford (1122/1123–1197) | | Roger Fitzmiles (before 1125–1155) 2nd Earl of Hereford |
| | | | | | | | | | | | | | | | | | Earldom of Essex (1st creation) extinct, 1189 | | | | | | | Earldom of Hereford (5th creation) extinct, 1155 |
Earl of Essex (2nd creation), 1199 | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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Geoffrey Fitz Peter (c. 1162–1213) 1st Earl of Essex | | Beatrice de Say | | Geoffrey de Saye II (1155–1230) | | Hawise ("Alice") de Clare | | Humphrey III de Bohun (before 1144–1181) |
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| | | | | | | | | | | | | | | | | | Earl of Hereford (6th creation), 1199 |
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| | | | Geoffrey FitzGeoffrey de Mandeville (c. 1191–1216) 2nd Earl of Essex | | William FitzGeoffrey de Mandeville (d. 1227) 3rd Earl of Essex | | Maud FitzGeoffrey Maud de Mandeville | | Henry de Bohun (1176–1220) 1st Earl of Hereford |
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| | | | | | | | Earldom of Essex (2nd creation) extinct, 1227 | | | | | | | | |
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| | | | | | | | | | | | Earl of Essex (3rd creation), 1239 |
| | | | | | | | | | | | Humphrey de Bohun (1204–1275) 1st Earl of Essex, 2nd Earl of Hereford | |
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| | | | | | | | | | | | Humphrey de Bohun (d. 1265) | |
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| | | | Edward I (1239–1307) King of England | | | | | | Humphrey de Bohun (c. 1249–1298) 2nd Earl of Essex, 3rd Earl of Hereford |
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| | | | Edward II (1284–1327) King of England | | Elizabeth of Rhuddlan (1282–1316) | | Humphrey de Bohun (1276–1322) 3rd Earl of Essex, 4th Earl of Hereford |
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| | | | Edward III (1312–1377) King of England | | John de Bohun (1306–1336) 4th Earl of Essex, 5th Earl of Hereford | | Humphrey de Bohun (1309–1361) 5th Earl of Essex, 6th Earl of Hereford | | William de Bohun (c. 1312–1360) 1st Earl of Northampton |
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| | | | | | | | | | | | | | | | | Humphrey de Bohun (1342–1373) 6th Earl of Essex, 7th Earl of Hereford |
| | | | | | | | | | | | | | | | | Earldom of Essex (3rd creation) and Earldom of Hereford (6th creation) extinct, 1373 |
| | | | Earl of Essex (4th creation), 1376 | | | | | | | | | | | | | | |
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| | | | Thomas of Woodstock (1355–1397) Earl of Essex | | Eleanor de Bohun (c. 1366–1399) | | | | | | Mary de Bohun (c. 1369/1370–1394) | | Henry IV (1367–1413) King of England |
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| | | | Earldom of Essex (4th creation) forfeit, 1397 | | | |
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| | | | William Bourchier (1374–1420) | | Anne of Gloucester (1383–1438) |
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| | | | Earl of Essex (5th creation), 1461 |
| | | | Henry Bourchier (c. 1404/1406–1483) 1st Earl of Essex |
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| | | | William Bourchier (d. 1480) Viscount Bourchier | | Anne Woodville (1438–1489) | | Elizabeth Woodville (c. 1437–1492) | | Edward IV (1442–1483) King of England |
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John Devereux (c. 1464–1501) 9th Baron Ferrers of Chartley | | Cecily Bourchier (died c. 1492/1493) | | Henry Bourchier (c. 1467/80–1540) 2nd Earl of Essex | | | | | | Elizabeth of York (1466–1503) | | Thomas Parr (1478–1517) |
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| | | | | | | | | Earldom of Essex (5th creation) forfeit 1540 | | | | | | | | | | | | | | | | |
Viscount Hereford | | | | | | | | | | Earl of Essex (6th creation), 1540 | | | | | | | | | | | | |
Walter Devereux (1488–1558) 1st Viscount Hereford, 10th Baron Ferrers of Chartley | | | | | | | | | | Thomas Cromwell (1485–1540) Earl of Essex | | Henry VIII (1491–1547) King of England | | | | | | | | | | | |
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| | | | | | | | | | | | | | Earldom of Essex (6th creation) forfeit, 1540 | | | | | | | | | | | | Earl of Essex (7th creation), 1543 |
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Richard Devereux (c. 1513–1547) | | | | | | | | | | | | | | | | | | | | Catherine Parr (1512–1548) | | William Parr (1513–1571) Marquess of Northampton, Earl of Essex |
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| | | | | | | | | | | | | | | | | | | | | | | | | | Earldom of Essex (7th creation) forfeit 1553, restored 1559, extinct 1571 |
Earl of Essex (8th creation), 1572 | | | | | | Devereux Baronet of Castle Bromwich, 1611 |
Walter Devereux (1541–1576) 1st Earl of Essex, 2nd Viscount Hereford | | | | | | Edward Devereux c. 1550–1622 1st Baronet |
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Robert Devereux (1565–1601) 2nd Earl of Essex, 3rd Viscount Hereford | | | | | | | | | | Walter Devereux 1578–1658 5th Viscount Hereford, 2nd Baronet | | | | | | George Devereux (c. 1581–1665) |
Earldom of Essex forfeit, 1601 | | | | | | | | | | | | | | | | | | | | | | |
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Earldom of Essex (8th creation) restored, 1604 | | Baron Capell of Hadham, 1641 | | | | | | | | | | | | | | | | | | |
Robert Devereux (1591–1646) 3rd Earl of Essex, 4th Viscount Hereford | | Arthur Capell (1604–1649) 1st Baron Capell of Hadham | | | | | | Leicester Devereux 1617–1676 6th Viscount Hereford, 3rd Baronet | | | | | | | | | |
Earldom of Essex (8th creation) extinct, 1646 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| | | | Earl of Essex (9th creation), 1661 | | Baron Capell of Tewkesbury in the County of Gloucester, 1692 | | | | | | | | | | | | | | | | | | | | |
| | | | Arthur Capell (1631–1683) 2nd Baron Capell of Hadham 1st Earl of Essex | | Henry Capell (1638–1696) Baron Capell of Tewkesbury | | | | | | | | | | | | Price Devereux (c. 1637–1673) | | Vaughan Devereux (d. 1700) |
| | | | | | | | | Barony Capell of Tewkesbury extinct, 1696 | | | | | | | | | | | | | | | | | | | | |
| | | | Algernon Capell (1670–1710) 2nd Earl of Essex | | | | | | Leicester Devereux 1674–1683 7th Viscount Hereford, 4th Baronet | | Edward Devereux 1675–1700 8th Viscount Hereford, 5th Baronet | | Price Devereux 1664–1740 9th Viscount Hereford, 6th Baronet | | Arthur Devereux d. 1711 |
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| | | | William Capell (1697–1743) 3rd Earl of Essex | | | | | | | | | | | | | | Price Devereux 1694–1748 10th Viscount Hereford, 7th Baronet | | Edward Devereux c. 1710–1760 11th Viscount Hereford, 8th Baronet |
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Frances Hanbury-Williams (c. 1735–1759) | | William Capell (1732–1799) 4th Earl of Essex | | Harriet Bladen (1735–1821) | | | | | | | | | | Edward Devereux 1740–1783 12th Viscount Hereford, 9th Baronet | | George Devereux 1744–1804 13th Viscount Hereford, 10th Baronet |
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| | | | George Capel-Coningsby (1757–1839) 5th Earl of Essex | | John Thomas Capell (1769–1819) | | | | | | William Capell (1775–1854) | | | | | | Henry Fleming Lea Devereux 1777–1843 14th Viscount Hereford, 11th Baronet |
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Arthur Algernon Capell (1803–1892) 6th Earl of Essex | | Algernon Capell (1807–1886) | | Adolphus Capell (1813–1899) | | | | | | Edward Capell | | Henry Devereux 1807–1839 | | Robert Devereux 1809–1855 15th Viscount Hereford, 12th Baronet |
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Arthur de Vere Capell (1826–1879) Viscount Malden | | Charles Capell (1845–1924) | | Horatio Bladen Capell (1839–1933) | | | | | | | | | | Arthur Capell | | Robert Devereux 1843–1930 16th Viscount Hereford, 13th Baronet |
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George Devereux de Vere Capell (1857–1916) 7th Earl of Essex | | Arthur Algernon de Vere Capell (1891–1950) | | Horace Charles George Arthur Capell (1868–1953) | | Algernon Essex Capell (1869–1952) | | Henry Addison Devereux Capell (1873–1925) | | Terence Capell | | Robert Charles Devereux 1865–1952 17th Viscount Hereford, 14th Baronet |
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Algernon George de Vere Capell (1884–1966) 8th Earl of Essex | | | | | | | Bladen Ozro Capell (1897–1959) | | Algernon Arthur Capell | | Robert Capell Sixth in line to the Earldom of Essex | | William Capell Seventh and last in line to the Earldom of Essex | | Robert Devereux 1894–1934 |
| | | | | Earldom of Essex (9th creation) revived, 1989 | | | | | | | | | | | | | | | | | | | | | | | |
Reginald George de Vere Capell (1906–1981) 9th Earl of Essex | | Robert Edward de Vere Capell (1920–2005) 10th Earl of Essex | | Bladen Horace Capell (1922–1978) | | Colin Capell | | | | | | | | | | Robert Milo Leicester Devereux 1932–2004 18th Viscount Hereford, 15th Baronet |
Earldom of Essex (9th creation) dormant, 1981 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| | | | Frederick Paul de Vere Capell (b. 1944) 11th Earl of Essex | | William Jennings "Bill" Capell (b. 1952) Heir presumptive to the Earldom of Essex | | Clint Capell Third in line to the Earldom of Essex | | Craig Capell Fourth in line to the Earldom of Essex | | | | | | | | | |
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| | | | | | | | Kevin Capell (b. 1982) Second in line to the Earldom of Essex | | | | | | Dylan Capell Fifth in line to the Earldom of Essex | | | | | | Charles Robin de Bohun Devereux b. 1975 19th Viscount Hereford, 16th Baronet |
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| | | | | | | | | | | | | | | | | | | | | | | | Henry Devereux b. 2015 |
| | | | | | | | | | | | | | | | | | | | | | | | Heir apparent to the Hereford Viscountcy |