| | | | | | | | King Henry III 1207–1272 |
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Baron Percy of Alnwick (2nd creation), 1299 | | | | | | | | | | | | | | |
Henry de Percy 1273–1314 8th Baron Percy of Topcliffe, 1st Baron Percy | | Edmund Crouchback 1245–1296 Earl of Leicester, Earl of Lancaster, Earl of Derby | | | | | | King Edward I 1239–1307 |
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Henry de Percy 1300–1351 9th Baron Percy of Topcliffe, 2nd Baron Percy | | Henry c. 1281–1345 Earl of Leicester, Earl of Lancaster, Earl of Derby | | | | | | King Edward II 1284–1327 |
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Henry de Percy 1320–1368 3rd Baron Percy | | Mary of Lancaster c. 1320–1321–1362 | | Henry of Grosmont c. 1310–1361 Duke of Lancaster, Earl of Lancaster, 4th Earl of Leicester | | King Edward III 1312–1377 |
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Earl of Northumberland (1st creation), 1377 | | Earl of Worcester | | | | | | | | | | |
Henry Percy 1341–1408 1st Earl of Northumberland, 4th Baron Percy | | Thomas Percy 1343–1403 Earl of Worcester | | Blanche of Lancaster 1342–1368 | | John of Gaunt 1340–1399 Duke of Lancaster, Earl of Leicester, Earl of Lancaster, Earl of Derby, Earl of Richmond |
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(attainted 1405) | | | | | | | | | | | | | | | | | | | |
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Henry Percy "Hotspur" c. 1365–1403 | | | | | | Joan Beaufort c. 1379–1440 | | | | | | John Beaufort c. 1370–1410 Earl of Somerset |
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Earl of Northumberland (2nd creation), 1416 | | | | | | | | | | | | | | | | | | | | | | | | |
Henry Percy 1394–1455 2nd Earl of Northumberland | | Eleanor Neville c. 1398–1472 | | Richard Neville 1400–1460 Earl of Salisbury | | | | | | John Beaufort 1404–1444 1st Duke of Somerset | | Edmund Beaufort 1406–1455 2nd Duke of Somerset |
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| | | | | | | | | Earl of Northumberland (3rd creation), 1464 | | | | | | | | | | |
Henry Percy 1421–1461 3rd Earl of Northumberland | | | | | | John Neville c. 1431–1471 Earl of Northumberland | | Eleanor Beaufort 1431–1501 | | Margaret Beaufort 1443–1509 |
(forfeit 1461) | | | | | | (released 1470) | | | | | | | | | | |
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(restored 1470) | | | | | | | | | | | | | | | | | | |
Henry Percy 1449–1489 4th Earl of Northumberland | | | | | | | | | | | | | | | King Henry VII 1457–1509 |
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Henry Algernon Percy 1478–1527 5th Earl of Northumberland | | Katherine Spencer 1477–1542 | | | | | | | | | | Mary Tudor (Queen of France) 1496–1533 m.(2) Charles Brandon Duke of Suffolk | | Margaret Tudor 1489–1541 |
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| | | | | | | | | | | Duke of Northumberland (1st creation), 1551 | | | | | | | | | | | | | | |
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Henry Percy 1502–1537 6th Earl of Northumberland | | Thomas Percy c. 1504–1537 | | John Dudley 1504–1553 1st Duke of Northumberland | | | | | | Frances Brandon 1517–1559 m. Henry Grey Duke of Suffolk | | James V of Scotland 1512–1542 |
| | | | (attainted 1537) | | (extinct 1553) | | | | | | | | | | | | | | |
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Earl of Northumberland (2nd creation) restored and Baron Percy of Alnwick (3rd creation), 1557 | | | | | | | | | | | | | | | | | | | | | | | | | |
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Thomas Percy 1528–1572 7th Earl of Northumberland, 1st Baron Percy | | Henry Percy 1532–1585 8th Earl of Northumberland, 2nd Baron Percy | | Guildford Dudley c. 1535–1554 | | Jane Grey c. 1537–1554 | | Lady Katherine Grey 1540–1568 m. Edward Seymour Earl of Hertford | | Mary, Queen of Scots 1542–1587 |
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| | | | Henry Percy 1564–1632 9th Earl of Northumberland, 3rd Baron Percy | | | | | | | | | | Edward Seymour 1561–1612 Viscount Beauchamp | | King James VI and I 1566–1625 |
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| | | | Algernon Percy 1602–1668 10th Earl of Northumberland, 4th Baron Percy | | | | | | | | | | Francis Seymour c. 1590–1664 Baron Seymour of Trowbridge | | King Charles I 1600–1649 |
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| | | | Josceline Percy 1644–1670 11th Earl of Northumberland, 5th Baron Percy | | | | | | | | | | Charles Seymour c. 1621–1665 Baron Seymour of Trowbridge | | King Charles II 1630–1685 |
| | | | Earldom of Northumberland and Barony Percy extinct, 1670 | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | Earl of Northumberland (4th creation), Viscount Falmouth (1st creation), and Baron of Pontefract, 1674 Duke of Northumberland (2nd creation), 1683 |
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| | | | | | | | Elizabeth Seymour 1667–1722 | | Charles Seymour 1662–1748 Duke of Somerset | | | | | | George FitzRoy 1665–1716 Duke of Northumberland, Earl of Northumberland, Viscount Falmouth, Baron of Pontefract |
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| | | | | | | | | | | | | | | | | | | | | | Earldom of Northumberland and Dukedom of Northumberland extinct, 1716 |
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| | | | | | | | Baron Percy (4th creation) created erroneously, 1722 Earl of Northumberland (5th creation) and Baron Warkworth, 1749 |
| | | | | | | | Algernon Seymour 1684–1750 Duke of Somerset, 1st Earl of Northumberland and Baron Warkworth, 1st Baron Percy |
Duke of Northumberland (3rd creation), 1766 Lord Lovaine, Baron of Alnwick in the County of Northumberland | | | | | | | | | |
Hugh Percy formerly Hugh Smithson 1714–1786 1st Duke of Northumberland, 2nd Earl of Northumberland and Baron Warkworth, 1st Baron Lovaine, 4th Baronet Smithson | | | | | | Elizabeth Seymour 1716–1776 2nd Baroness Percy suo jure |
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| | | | | | | | | | | | | Earl of Beverley, 1790 |
Hugh Percy 1742–1817 2nd Duke of Northumberland, 3rd Earl of Northumberland and Baron Warkworth, 3rd Baron Percy | | | | | | | | | | Algernon Percy 1750–1830 1st Earl of Beverley, 2nd Baron Lovaine |
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| | | | | | | | | | Baron Prudhoe, of Prudhoe Castle in the County of Northumberland, 1814 | | | | | |
Hugh Percy 1785–1847 3rd Duke of Northumberland, 4th Earl of Northumberland and Baron Warkworth, 4th Baron Percy | | Emily Frances Percy 1789–1844 | | Algernon Percy 1792–1865 4th Duke of Northumberland, 5th Earl of Northumberland and Baron Warkworth, 1st Baron Prudhoe, 5th Baron Percy | | George Percy 1778–1867 5th Duke of Northumberland, 6th Earl of Northumberland and Baron Warkworth, 2nd Earl of Beverley, 3rd Baron Lovaine |
| | | | | | | | | Barony Prudhoe extinct, 1865 | | | | | |
| | | | George Augustus Frederick John Murray 1814–1864 6th Duke of Atholl, 11th Baron Strange | | | | | | Algernon George Percy 1810–1899 6th Duke of Northumberland, 7th Earl of Northumberland and Baron Warkworth, 3rd Earl of Beverley, 4th Baron Lovaine |
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| | | | John James Hugh Henry Stewart-Murray 1840–1917 7th Duke of Atholl, 12th Baron Strange, 6th Baron Percy | | | | | | Henry George Percy 1846–1918 7th Duke of Northumberland, 8th Earl of Northumberland and Baron Warkworth, 4th Earl of Beverley, 5th Baron Lovaine |
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| | | | John George Stewart-Murray 1871–1942 8th Duke of Atholl, 13th Baron Strange, 7th Baron Percy | | James Thomas Stewart-Murray 1879–1957 9th Duke of Atholl, 14th Baron Strange, 8th Baron Percy | | Alan Ian Percy 1880–1930 8th Duke of Northumberland, 9th Earl of Northumberland and Baron Warkworth, 5th Earl of Beverley, 6th Baron Lovaine |
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| | | | | | | | | | | | Henry George Alan Percy 1912–1940 9th Duke of Northumberland, 10th Earl of Northumberland and Baron Warkworth, 6th Earl of Beverley, 7th Baron Lovaine | | Hugh Algernon Percy 1914–1988 10th Duke of Northumberland, 11th Earl of Northumberland and Baron Warkworth, 7th Earl of Beverley, 8th Baron Lovaine, 9th Baron Percy |
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| | | | | | | | | | | | | | | | Henry Alan Walter Richard Percy 1953–1995 11th Duke of Northumberland, 12th Earl of Northumberland and Baron Warkworth, 8th Earl of Beverley, 9th Baron Lovaine, 10th Baron Percy | | Ralph George Algernon Percy b. 1956 12th Duke of Northumberland, 13th Earl of Northumberland and Baron Warkworth, 9th Earl of Beverley, 10th Baron Lovaine, 11th Baron Percy |
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| | | | | | | | | | | | | | | | | | | | George Dominic Percy b. 1984 styled Earl Percy |
| | | | | | | | | | | | | | | | | | | | Heir apparent to the Dukedom of Northumberland |