| | | | | | | | Gerald de Windsor | | Nest ferch Rhys |
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| | | | | | | | Maurice FitzGerald c. 1105–1176 Lord of Lanstephan |
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| | | | | | | | Baron Offaly, 1175 | | | | | |
| | | | | | | | Gerald FitzMaurice c. 1150–1204 1st Lord of Offaly | | Thomas FitzMaurice c. 1175–1213 Lord of O'Connelloe |
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| | | | | | | | Maurice FitzGerald 1194–1257 2nd Lord of Offaly | | Earl of Desmond |
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| | | | Maurice FitzGerald 3rd Lord of Offaly 1238–c. 1286 | | Thomas FitzGerald d. 1271 |
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| | | | | | | | Earl of Kildare, 1316 |
| | | | | | | | John FitzGerald 1250–1316 1st Earl of Kildare, 4th Lord of Offaly |
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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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| | | | | | | | | | | | | | | | Thomas FitzGerald c. 1421–1478 7th Earl of Kildare |
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| | | | | | | | | | | | | | | | Gerald FitzGerald c. 1456–1513 8th Earl of Kildare |
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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 | | | | |
| | | | | | | | Thomas FitzGerald 1513–1537 10th Earl of Kildare | | Gerald FitzGerald 1525–1585 1st & 11th Earl of Kildare | | Edward FitzGerald 1528–1590 |
| | | | | | | | Kildare earldom (1st creation) forfeit, 1537 | | | | | | | | | | |
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| | | | King James VI & I 1566–1625 | | Henry FitzGerald 1562–1597 2nd & 12th Earl of Kildare | | William FitzGerald c. 1563–1599 3rd & 13th Earl of Kildare | | 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 |
| | | | | Duke of Schomberg, Marquess of Harwich, Earl of Brentford and Baron Teyes, 1689 | | | | | | | | | | | | | | | | | | | |
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Charles Louis 1617–1680 Elector Palatine | | Frederick Schomberg 1615–1690 1st Duke of Schomberg, Marquess of Harwich, Earl of Brentford and Baron Teyes, Count of Mértola (Portugal) | | | | | | 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 | | | | | | | | | | | | | | | | | | | | |
Raugravine Caroline Elisabeth 1659–1696 | | Meinhardt Schomberg 1641–1719 3rd Duke of Schomberg, Marquess of Harwich, Earl of Brentford and Baron Teyes, Duke of Leinster, Earl of Bangor, Baron Tara, Count of Mértola (Portugal) | | Charles Schomberg 1645–1693 2nd Duke of Schomberg, Marquess of Harwich, Earl of Brentford and Baron Teyes, Count of Mértola (Portugal) | | Charles Lennox 1672–1723 Duke of Richmond | | John FitzGerald 1661–1707 18th Earl of Kildare | | Robert FitzGerald 1675–1744 19th Earl of Kildare |
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| | | | Dukedom of Leinster (1st creation) and Dukedom of Schomberg extinct, 1719 | | | | | | | | | | | | | | | | | | | |
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| | | | | | | | | | | | Charles Lennox 1701–1750 Duke of Richmond | | | | | |
| | | | | | | | | | | | | | | | | Viscount Leinster, of Taplow in the County of Buckingham, 1747 Marquess of Kildare, 1761 Duke of Leinster (2nd creation), 1766 |
| | | | | | | | | | | | 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 |
| | | | | | | | 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 |
| | | | | | | | | | | | | | | | | | Lecale barony extinct, 1810 | | | | | |
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| | | | | | | | 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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| | | | | | | | | | | | | | | | | | | | | Baron Kildare, 1870 |
| | | | | | | | | | | | 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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| | | | | | | | | | | | 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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| | | | | | | | | | | | 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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| | | | | | | | 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 |