| | | | Gerald de Windsor | | Nest ferch Rhys |
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| | | | | | | | | | |
| | | |
| | | | Maurice FitzGerald
(c. 1105–1176)
Lord of Lanstephan |
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| | | | | | | | | | | | |
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| | | | Baron Offaly, 1175 | | | | | |
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| | | | Gerald FitzMaurice
(c. 1150–1204)
1st Lord of Offaly | | Thomas FitzMaurice
(c. 1175–1213)
Lord of O'Connelloe |
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| | | | | | | | | | | |
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| | | | Maurice FitzGerald
(1194–1257)
2nd Lord of Offaly | | Earl of Desmond |
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| | | | | | | | |
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Maurice FitzGerald
3rd Lord of Offaly
(1238–c. 1286) | | Thomas FitzGerald
(d. 1271) |
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| | | | | | | |
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| | | | Earl of Kildare, 1316 |
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| | | | John FitzGerald
(1250–1316)
1st Earl of Kildare, 4th Lord of Offaly |
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| | | | | | | |
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| | | | Thomas FitzGerald
(d. 1328)
2nd Earl of Kildare |
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| | | | | | | | | | | | |
| | | | |
| | | | Richard FitzGerald
(1317–1329)
3rd Earl of Kildare | | Maurice FitzGerald
(1318–1390)
4th Earl of Kildare |
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| | | | | | | | | | | | | | | | |
| | | | |
| | | | | | | | Gerald FitzGerald
(d. 1432)
5th Earl of Kildare | | John FitzGerald
(d. 1434)
6th Earl of Kildare |
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| | | | | | | | | | | | | | | |
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| | | | | | | | | | | | Thomas FitzGerald
(c. 1421–1478)
7th Earl of Kildare |
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| | | | | | | | | | | | | | | |
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| | | | | | | | | | | | Gerald FitzGerald
(c. 1456–1513)
8th Earl of Kildare |
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| | | | | | | | | | | | | | | |
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| | | | | | | | | | | | Gerald FitzGerald
(1487–1534)
9th Earl of Kildare |
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| | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | |
| | | | | Earl of Kildare (2nd creation), 1554
Ancient earldom restored, 1569 | | | | | | | | |
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Thomas FitzGerald
(1513–1537)
10th Earl of Kildare | | Gerald FitzGerald
(1525–1585)
1st & 11th Earl of Kildare | | | | | | Edward FitzGerald
(1528–1590) |
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| Kildare earldom (1st creation) forfeit, 1537 | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | |
Henry FitzGerald
(1562–1597)
2nd & 12th Earl of Kildare | | William FitzGerald
(c. 1563–1599)
3rd & 13th Earl of Kildare | | King James VI & I
(1566–1625) | | Gerald FitzGerald
(d. 1612)
14th Earl of Kildare | | Thomas FitzGerald
(c. 1560–1619) |
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| | | | | | | | | | | | | | | | | | | | | | |
| | | | | |
| | | | Elizabeth, Queen of Bohemia
(1596–1662) | | King Charles I
(1600–1649) | | Gerald FitzGerald
(1611–1620)
15th Earl of Kildare | | George FitzGerald
(1612–1660)
16th Earl of Kildare |
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| | | | | | | | | | | | | | | | | | | | | | |
| | | | | |
| | | | Charles Louis
(1617–1680)
Elector Palatine | | King Charles II
(1630–1685) | | Wentworth FitzGerald
(1634–1664)
17th Earl of Kildare | | Robert FitzGerald
(1638–1698) |
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| Duke of Leinster (1st creation), 1691 | | | | | | | | | | | | | | | | | | | | |
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Meinhardt Schomberg
(1641–1719)
Duke of Leinster, Duke of Schomberg, Marquess of Harwich, Earl of Brentford, Earl of Bangor, Baron Tara, Count of Mértola (Portugal) | | Raugravine Caroline Elisabeth
(1659–1696) | | Charles Lennox
(1672–1723)
Duke of Richmond | | John FitzGerald
(1661–1707)
18th Earl of Kildare | | Robert FitzGerald
(1675–1744)
19th Earl of Kildare |
| |
| Dukedom of Leinster (1st creation) extinct, 1719 | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | |
| | | | Charles Schomberg
(1683–1713)
styled Marquess of Harwich | | Charles Lennox
(1701–1750)
Duke of Richmond | | | | | |
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| | | | | | | | | | | | | Viscount Leinster, of Taplow in the County of Buckingham, 1747
Marquess of Kildare, 1761
Duke of Leinster (2nd creation), 1766 |
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| | | | | | | | Emily Lennox
(1731–1814) | | James FitzGerald
(1722–1773)
1st Duke of Leinster, 1st Marquess of Kildare, 20th Earl of Kildare, 1st Earl of Offaly, 1st Viscount Leinster, 1st Baron Offaly |
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| | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | Baron Lecale | | Baron Rayleigh |
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| | | | George FitzGerald
(1748–1765)
styled Earl of Offaly | | William Robert FitzGerald
(1749–1804)
2nd Duke of Leinster, 2nd Marquess of Kildare, 21st Earl of Kildare, 2nd Earl of Offaly, 2nd Viscount Leinster, 2nd Baron Offaly | | Charles James FitzGerald
(1756–1810)
Baron Lecale | | Charlotte Strutt
(1758–1836)
1st Baroness Rayleigh |
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| | | | | | | | | | | | | | Lecale barony extinct, 1810 | | | | | |
| | | | | |
| | | | George FitzGerald
(1783–1784)
styled Marquess of Kildare | | Augustus Frederick FitzGerald
(1791–1874)
3rd Duke of Leinster, 3rd Marquess of Kildare, 22nd Earl of Kildare, 3rd Earl of Offaly, 3rd Viscount Leinster, 8th Baron Offaly | | | | | | John James Strutt
(1796–1873)
2nd Baron Rayleigh |
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| | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | | | | | | Baron Kildare, 1870 |
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| | | | | | | | Charles William FitzGerald
(1819–1887)
4th Duke of Leinster, 4th Marquess of Kildare, 23rd Earl of Kildare, 4th Earl of Offaly, 4th Viscount Leinster, 9th Baron Offaly, 1st Baron Kildare | | | | | | | | | |
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| | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | Gerald FitzGerald
(1851–1893)
5th Duke of Leinster, 5th Marquess of Kildare, 24th Earl of Kildare, 5th Earl of Offaly, 5th Viscount Leinster, 10th Baron Offaly, 2nd Baron Kildare | | | | | | John William Strutt
(1842–1919)
3rd Baron Rayleigh |
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| | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | |
Maurice FitzGerald
(1887–1922)
6th Duke of Leinster, 6th Marquess of Kildare, 25th Earl of Kildare, 6th Earl of Offaly, 6th Viscount Leinster, 11th Baron Offaly, 3rd Baron Kildare | | Lord Desmond FitzGerald
(1888–1916) | | Edward FitzGerald
(1892–1976)
7th Duke of Leinster, 7th Marquess of Kildare, 26th Earl of Kildare, 7th Earl of Offaly, 7th Viscount Leinster, 12th Baron Offaly, 4th Baron Kildare | | | | | | Robert John Strutt
(1875–1947)
4th Baron Rayleigh |
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| | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | Gerald FitzGerald
(1914–2004)
8th Duke of Leinster, 8th Marquess of Kildare, 27th Earl of Kildare, 8th Earl of Offaly, 8th Viscount Leinster, 13th Baron Offaly, 5th Baron Kildare | | | | | | John Arthur Strutt
(1908–1988)
5th Baron Rayleigh |
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| | | | | | | | | | | | | | | | | | | | | |
| | | | | |
| | | | Maurice FitzGerald
(b. 1948)
9th Duke of Leinster, 9th Marquess of Kildare, 28th Earl of Kildare, 9th Earl of Offaly, 9th Viscount Leinster, 14th Baron Offaly, 6th Baron Kildare | | Lord John FitzGerald
(1952–2015) | | | | | | John Gerald Strutt
(b. 1960)
6th Baron Rayleigh |
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| | | | | | | | | | | | | | | | | | | | | |
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| | | | Thomas FitzGerald
(1974–1997)
styled Earl of Offaly | | Edward FitzGerald
(b. 1988) | | | | | | John Frederick Strutt
(b. 1993) |
|
| | | | | | | | Heir presumptive to the Leinster dukedom | | | | | | Heir apparent to the Barony Rayleigh |
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