|  |  |  |  | Baron Willoughby, 1313 | 
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 |  |  |  |  | Robert de Willoughby 1260–1317
 1st Baron Willoughby
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 |  |  |  |  | John de Willoughby 1304–1349
 2nd Baron Willoughby
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 |  |  |  |  | suffix de Eresby added, c. 1350–1360 | 
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 |  |  |  |  | John de Willoughby 1329–1372
 3rd Baron Willoughby de Eresby
 |  |  |  |  |  |  |  |  |  | John (de) Welles 1334–1361
 4th Baron Welles
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 |  |  |  |  | Robert Willoughby 1349–1396
 4th Baron Willoughby de Eresby
 |  |  |  |  |  |  |  |  |  | John Welles 1352–1421
 5th Baron Welles
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 |  |  |  |  | William Willoughby c. 1370–1409
 5th Baron Willoughby de Eresby
 |  |  |  |  |  |  |  |  |  | Eudes (or Eudo) Welles 1387–1417
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 | Robert Willoughby c. 1385–1452
 6th Baron Willoughby de Eresby
 |  |  |  |  |  |  |  |  |  | Thomas Willoughby |  | Lionel (de) Welles c. 1406–1461
 6th Baron Welles
 |  |  |  |  |  |  |  |  |  | Margaret Beauchamp c. 1410 – c. 1482
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 | Joan Willoughby c. 1425–bef. 1462
 7th Baroness Willoughby de Eresby
 |  | Richard Welles c. 1428–1470
 7th Baron Welles
 |  |  |  |  |  | Robert Willoughby d. 1465
 |  | Cecily Welles |  |  |  |  |  |  | Edward IV 1442–1483
 |  | Margaret Beaufort 1443–1509
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 |  |  |  |  |  | Barony Welles (1st creation) attainted, 1470 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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 |  |  |  |  |  |  |  |  |  |  |  | Baron Welles (2nd creation), 1483 |  |  |  |  |  |  |  | Viscount Welles, 1486 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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 | Robert Welles d. 1470
 8th Baron Willoughby de Eresby
 |  | Joan Welles d. bef. 1475
 9th Baron Willoughby de Eresby
 |  | Richard Hastings d. 1503
 Baron Welles
 |  | Christopher Willoughby 1453–1498/1499
 10th Baron Willoughby de Eresby
 |  | John Welles c. 1450–1498
 1st Viscount Welles
 |  | Cecily of York 1469–1507
 |  | Elizabeth of York 1466–1503
 |  | Henry VII of England 1457–1509
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 |  |  |  |  |  |  |  |  | Barony Welles (2nd creation) possibly extinct, 1503 |  |  |  |  |  |  | Viscountcy Welles extinct, 1498 |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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 |  |  |  |  |  |  |  |  |  |  |  |  | William Willoughby 1482–1526
 11th Baron Willoughby de Eresby
 |  |  | Charles Brandon c. 1484–1545
 1st Duke of Suffolk
 |  | Mary Tudor 1496–1533
 |  | Louis XII of France 1462–1515
 |  | Henry VIII of England 1491–1547
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 | Baron Norreys of Rycote, 1572 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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 | Henry Norris (c. 1530–1601)
 1st Baron Norreys
 |  |  |  |  |  | Richard Bertie 1516–1582
 |  | Katherine Brandon 1519–1580
 12th Baroness Willoughby de Eresby
 |  |  |  |  |  |  | Frances Grey 1517–1559
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 | William Norreys (1552–1579)
 |  |  |  |  |  |  |  |  |  | Peregrine Bertie 1555–1601
 13th Baron Willoughby de Eresby
 |  |  |  |  |  | Lady Jane Grey 1536/1537–1554
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 | Earl of Berkshire and Viscount Thame, 1621 |  |  |  |  |  |  |  |  |  | Earl of Lindsey, 1626 | 
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 | Francis Norris 1582–1624
 Earl of Berkshire and Viscount Thame, 2nd Baron Norreys
 |  |  |  |  |  |  |  |  |  | Robert Bertie 1582–1642
 1st Earl of Lindsey, 14th Baron Willoughby de Eresby
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 | Earldom of Berkshire and Viscountcy Thame extinct, 1624 |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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 | Elizabeth Wray d. 1645
 3rd Baroness Norreys
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 | Bridget Bertie 1627–1657
 4th Baroness Norreys
 |  |  |  |  |  |  |  |  |  | Montagu Bertie 1608–1666
 2nd Earl of Lindsey, 15th Baron Willoughby de Eresby
 |  | Martha Cockayne | 
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 |  |  |  |  | Earl of Abingdon, 1682 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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 |  |  |  |  | James Bertie 1653–1669
 1st Earl of Abingdon, 5th Baron Norreys
 |  |  |  |  |  | Robert Bertie 1630–1701
 3rd Earl of Lindsey, 16th Baron Willoughby de Eresby
 |  |  |  |  |  |  |  |  |  | Charles Bertie c. 1640 – c. 1710
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Duke of Ancaster and Kesteven and Marquess of Lindsey, 1706 |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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 | Montagu Venables-Bertie 1673–1743
 2nd Earl of Abingdon, 6th Baron Norreys
 |  | James Bertie 1674–1735
 |  |  |  |  |  | Robert Bertie 1660–1723
 1st Duke of Ancaster and Kesteven and Marquess of Lindsey, 4th Earl of Lindsey, 17th Baron Willoughby de Eresby
 |  |  |  |  |  |  |  |  |  | Charles Bertie c. 1678–1730
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 |  |  |  |  | Willoughby Bertie 1692–1760
 3rd Earl of Abingdon, 7th Baron Norreys
 |  |  |  |  |  | Peregrine Bertie 1686–1742
 2nd Duke of Ancaster and Kesteven and Marquess of Lindsey, 5th Earl of Lindsey, 18th Baron Willoughby de Eresby
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | Peregrine Bertie 1714–1778
 3rd Duke of Ancaster and Kesteven and Marquess of Lindsey, 6th Earl of Lindsey, 19th Baron Willoughby de Eresby
 |  |  |  |  |  | Brownlow Bertie 1729–1809
 5rd Duke of Ancaster and Kesteven and Marquess of Lindsey, 8th Earl of Lindsey
 |  | Peregrine Bertie c. 1709 – c. 1779
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Baron Gwydyr, 1796 |  | Dukedom of Ancaster and Kesteven and Marquessate of Lindsey extinct, 1809 |  |  |  |  |  | 
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 |  |  |  |  | Willoughby Bertie 1740–1799
 4th Earl of Abingdon, 8th Baron Norreys
 |  | Robert Bertie 1756–1779
 4th Duke of Ancaster and Kesteven and Marquess of Lindsey, 7th Earl of Lindsey, 20th Baron Willoughby de Eresby
 |  | Priscilla Bertie 1761–1828
 21st Baroness Willoughby de Eresby
 |  | Peter Burrell 1754–1820
 1st Baron Gwydyr
 |  |  |  |  |  | Albemarle Bertie 1744–1818
 9th Earl of Lindsey
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 |  |  |  |  | Montagu Bertie 1784–1854
 5th Earl of Abingdon, 9th Baron Norreys
 |  |  |  |  |  | Peter Drummond-Burrell 1782–1865
 22nd Baron Willoughby de Eresby, 2nd Baron Gwydyr
 |  |  |  |  |  | Lindsey Merrik Peter Burrell |  |  |  |  |  | 
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 |  |  |  |  |  |  |  |  |  | Baron Aveland, 1856 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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 |  |  |  |  | Montagu Bertie 1808–1884
 6th Earl of Abingdon, 10th Baron Norreys
 |  | Gilbert Heathcote 1794–1867
 1st Baron Aveland
 |  | Clementina Drummond-Willoughby 1809–1888
 24th Baron Willoughby de Eresby
 |  | Albyric Drummond-Willoughby 1821–1870
 23rd Baron Willoughby de Eresby, 3rd Baron Gwydyr
 |  | Peter Robert Burrell 1810–1909
 4th Baron Gwydyr
 |  | George Augustus Frederick Albemarle Bertie 1814–1877
 10th Earl of Lindsey
 |  | Montague Peregrine Bertie 1815–1899
 11th Earl of Lindsey
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 |  |  |  |  |  |  |  |  |  | Baron Bertie of Thame, 1915 , 1918
 |  | Earl of Ancaster, 1892 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 
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 | Montagu Arthur Bertie 1836–1928
 7th Earl of Abingdon
 |  |  |  |  |  | 1844–1919
 1st Viscount Bertie of Thame and Baron Bertie of Thame
 |  | Gilbert Heathcote-Drummond-Willoughby 1830–1910
 1st Earl of Ancaster, 25th Baron Willoughby de Eresby, 2nd Baron Aveland
 |  |  |  |  |  | Willoughby Merrik Campbell Burrell 1841–1915
 5th Baron Gwydyr
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Barony Gwydyr extinct, 1915 |  |  |  |  |  |  |  |  |  | 
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 | Montagu Charles Francis Bertie 1860–1919
 |  |  |  |  |  |  | Vere Frederick Bertie 1878–1954
 2nd Viscount Bertie of Thame and Baron Bertie of Thame
 |  | Gilbert Heathcote-Drummond-Willoughby 1867–1951
 2nd Earl of Ancaster, 26th Baron Willoughby de Eresby, 3rd Baron Aveland
 |  |  |  |  |  |  |  |  |  |  |  |  |  | Montague Peregrine Albemarle Bertie 1861–1938
 12th Earl of Lindsey
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 |  |  |  |  |  |  |  |  |  |  | Viscountcy and Barony Bertie of Thame extinct, 1954 |  |  |  |  |  | 
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 | Montagu Henry Edmund Cecil Towneley-Bertie 1887–1963
 13th Earl of Lindsey, 8th Earl of Abingdon
 |  | Arthur Michael Cosmo Bertie 1886–c. 1954–1957
 |  |  |  |  |  | Gilbert James Heathcote-Drummond-Willoughby 1907–1983
 3rd Earl of Ancaster, 27th Baron Willoughby de Eresby, 4th Baron Aveland
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | Earldom of Ancaster and Barony of Aveland extinct, 1983 | 
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 |  |  |  |  | Richard Henry Rupert Bertie b. 1931
 14th Earl of Lindsey, 9th Earl of Abingdon
 |  |  |  |  |  | Nancy Jane Marie Heathcote-Drummond-Willoughby b. 1934
 28th Baroness Willoughby de Eresby
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