|  |  |  |  |  |  |  |  | King Henry III 1207–1272
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 | Baron Percy of Alnwick (2nd creation), 1299 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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 | 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 |  |  |  |  |  |  |  |  |  |  | 
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 | 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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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 | 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 |  |  |  |  |  |  |  |  |  |  | 
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 | Henry Percy 1421–1461
 3rd Earl of Northumberland
 |  |  |  |  |  | John Neville c. 1431–1471
 Earl of Northumberland
 |  | Eleanor Beaufort 1431–1501
 |  | Margaret Beaufort 1443–1509
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 | (forfeit 1461) |  |  |  |  |  | (released 1470) |  |  |  |  |  |  |  |  |  |  | 
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 | (restored 1470) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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 | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  | 
 | 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
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 |  |  |  |  | (attainted 1537) |  | (extinct 1553) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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|  |  |  |  |  |  | 
 | Earl of Northumberland (2nd creation) restored and Baron Percy of Alnwick (3rd creation), 1557 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  | 
 | 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
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 |  |  |  |  | Earldom of Northumberland and Barony Percy extinct, 1670 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 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 | 
|  |  |  |  | 
 |  |  |  |  |  |  |  |  | Baron Percy (4th creation) created erroneously, 1722 Earl of Northumberland (5th creation) and Baron Warkworth, 1749
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 |  |  |  |  |  |  |  |  | Algernon Seymour 1684–1750
 Duke of Somerset, 1st Earl of Northumberland and Baron Warkworth, 1st Baron Percy
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 | Duke of Northumberland (3rd creation), 1766 Lord Lovaine, Baron of Alnwick in the County of Northumberland
 |  |  |  |  |  |  |  |  |  | 
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 | 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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
|  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
 |  |  |  |  |  |  |  |  |  |  |  |  |  | , 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 |  |  |  |  |  | 
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 | 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
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 |  |  |  |  |  |  |  |  |  | Barony Prudhoe extinct, 1865 |  |  |  |  |  | 
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 |  |  |  |  | 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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | George Dominic Percy b. 1984
 styled Earl Percy
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Heir apparent to the Dukedom of Northumberland | 
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