| | | | | | | | Maurice FitzGerald "Maurice de Windsor" c. 1105–c. 1176 Lord of Llanstephan, Baron of Naas, Lord of Maynooth |
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Robert FitzMaurice Details unknown | | | | | | | | | | | | | | Thomas FitzMaurice FitzGerald c. 1145–1213 Lord OConnello | | Gerald FitzMaurice c. 1150–1203 1st Baron of Offaly |
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| Baron Kerry and Lixnaw, 1223 | | | | | | | | | | | | | | | | | | | See Baron of Offaly |
Thomas Fitzmaurice c. 1220–1280 1st Baron Kerry and Lixnaw Lord OConnello | | | | | | | | | | | | | | John FitzThomas d. 1261 1st Baron Desmond |
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Maurice Fitzthomas d. c. 1260 2nd Baron Kerry and Lixnaw | | | | | | | | | | | | | | Maurice FitzJohn FitzGerald d. 1261 |
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Nicholas Fitzthomas d. 1324 3rd Baron Kerry and Lixnaw | | | | | | | | | | | | | | Thomas Fitzmaurice FitzGerald d. 1298 2nd Baron Desmond |
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| | | | | | | | | | | | | | Earl of Desmond (1st creation), 1329 | | | | | |
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Maurice Fitzthomas d. 1339 4th Baron Kerry and Lixnaw | | John Fitzthomas d. 1348 5th Baron Kerry and Lixnaw | | Aveline (Eleanor) | | Maurice FitzThomas FitzGerald d. 1358 1st Earl of Desmond, 4th Baron Desmond | | Thomas FitzThomas FitzGerald 1290–1307 3rd Baron Desmond |
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| | | | Maurice FitzJohn Fitzmaurice d. 1398 6th Baron Kerry and Lixnaw | | Maurice FitzMaurice FitzGerald "Maurice Óg" 1335–1398 2nd Earl of Desmond, 5th Baron Desmond | | Gerald FitzGerald 1335–1398 3rd Earl of Desmond, 6th Baron Desmond |
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| | | | Patrick FitzMaurice FitzJohn d. c. 1410 7th Baron Kerry and Lixnaw | | John FitzGerald d. 1399 4th Earl of Desmond, 7th Baron Desmond | | James FitzGerald d. 1462 6th Earl of Desmond, 9th Baron Desmond |
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| | | | Thomas FitzMaurice d. 1469 8th Baron Kerry and Lixnaw | | Thomas FitzGerald c. 1386–1420 5th Earl of Desmond, 8th Baron Desmond | | Thomas FitzJames FitzGerald "the Great Earl" d. c. 1467/68 7th Earl of Desmond, 10th Baron Desmond |
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| | | | Edmond FitzMaurice d. 1541 9th Baron Kerry and Lixnaw | | James fitz Thomas FitzGerald 1459–1487 8th Earl of Desmond, 11th Baron Desmond | | Maurice fitz Thomas FitzGerald d. 1520 9th (or 10th) Earl of Desmond, 12th Baron Desmond | | Thomas fitz Thomas FitzGerald 1454–1534 11th (or 12th) Earl of Desmond, 14th Baron Desmond | | John fitz Thomas FitzGerald d. 1536 12th Earl of Desmond de facto, 15th Baron Desmond de facto |
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| | | | Thomas FitzMaurice Details unknown | | | | | | James fitz Maurice FitzGerald d. 1529 10th (or 11th) Earl of Desmond, 13th Baron Desmond | | Maurice fitz Thomas FitzGerald d. 1529 | | James fitz John FitzGerald d. 1558 13th (or 14th) Earl of Desmond, 16th Baron Desmond |
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| | | | Edmond FitzMaurice d. 1543 10th Baron Kerry and Lixnaw | | | | | | Joan Fitzgerald d. 1565 | | | James fitz Maurice FitzGerald ("Court Page") d. 1540 12th (or 13th) Earl of Desmond de jure, 15th Baron Desmond de jure | | | | | |
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| | | | Barony Kerry and Lixnaw resigned, 1529 | | | | | | | | | | | | | | | | | | | | | | | | | |
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| Baron Odorney and Viscount Kilmaule, 1537 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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Edmond FitzMaurice d. 1541 11th Baron Kerry and Lixnaw | | Patrick FitzMaurice d. 1547 12th Baron Kerry and Lixnaw | | Gerard FitzMaurice d. 1550 15th Baron Kerry and Lixnaw | | Thomas Fitzmaurice 1502–1590 16th Baron Kerry and Lixnaw | | Margaret "the Fair" | | Thomas Butler ("Black Tom") c. 1531–1614 Earl of Ormond and Earl of Ossory | | | Gerald FitzGerald ("Rebel Earl") c. 1533–1583 14th (or 15th or 16th) Earl of Desmond, 17th Baron Desmond |
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| Barony Odorney and viscountcy Kilmaule extinct, 1541 | | | | | | | | | | | | | | | | | | | | | | | | | Earldom of Desmond (1st creation) attainted, 1582 |
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| | | | | | | | | | | | | | | | | | | | Lord Dingwall (2nd creation), 1609 Earl of Desmond (3rd creation) and Baron Dunmore, 1619 | | | | | | | Earl of Desmond (2nd creation for life), 1600 |
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Thomas FitzMaurice d. 1549 13th Baron Kerry and Lixnaw | | Edmond FitzMaurice d. 1549 14th Baron Kerry and Lixnaw | | Patrick Fitzmaurice 1551?–1600 17th Baron Kerry and Lixnaw | | | | | | Richard Preston d. 1628 Earl of Desmond and Baron Dunmore, 1st Lord Dingwall | | Elizabeth Preston c. 1585–1628 | | James FitzGerald ("Tower Earl") 1571–1601 Earl of Desmond |
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| | | | | | | | | | | | | Viscount Feilding and Baron Feilding, 1620 Earl of Denbigh, 1622 | | Earldom of Desmond (3rd creation) and barony Dunmore extinct, 1628 | | | | | | | | Earldom of Desmond (2nd creation) extinct, 1601 |
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| | | | | | | | Thomas Fitzmaurice 1574–1630 18th Baron Kerry | | William Feilding c. 1587–1643 1st Earl of Denbigh, etc. | | | | | | | | | |
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| | | | | | | | | | | | | Viscount Callan and Baron Fielding, 1622 Earl of Desmond (4th creation) on reversion, 1628 | | | | | | | | | |
| | | | | | | | Patrick FitzMaurice 1595–1661 19th Baron Kerry | | George Feilding c. 1614–1665 2nd Earl Denbigh, etc. 1st Earl of Desmond, etc. | | Earldom of Desmond created in expectation of marriage, which did not happen | | Elizabeth Butler 1615–1684 2nd Lady Dingwall suo jure |
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| | | | | | | | William FitzMaurice 1633–1697 20th Baron Kerry | | | | | | | | | | Thomas Butler 1634–1680 Earl of Ossory |
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| | | | | | | | Earl of Kerry, 1753 | | | | | | | | | | | | | |
| | | | | | | | Thomas FitzMaurice 1668–1741 1st Earl of Kerry, 21st Baron Kerry | | | | | | | | | | James Butler 1665–1745 Duke of Ormonde, Earl of Ossory, 3rd Lord Dingwall |
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| | | | | | | | | Viscount FitzMaurice and Baron Dunkeron, 1751 Earl of Shelburne (2nd creation), 1753 Baron Wycombe, 1760 |
William FitzMaurice 1694–1747 2nd Earl of Kerry, 22nd Baron Kerry | | | | | | John Petty-Fitzmaurice 1706–1761 1st Earl of Shelburne, etc. | | Baron Nairne |
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| | | | | | | | | Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston, 1784 | | | | | | | Baron Keith (1st creation: Ireland), 1797 Baron Keith (2nd creation: UK), 1801 Baron Keith (3rd creation: UK), 1803 Viscount Keith (UK), 1814 |
Francis Thomas-Fitzmaurice 1740–1818 3rd Earl of Kerry, 23rd Baron Kerry | | | | | | William Petty-Fitzmaurice 1737–1805 1st Marquess of Lansdowne, etc., 2nd Earl of Shelburne, etc. | | Jane Mercer | | George Keith Elphinstone 1746–1823 Viscount Keith, Baron Keith (Ire, UK, UK) |
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| | | | | | | | | | | | | | | | | | | | Viscountcy Keith and Barony Keith (1st creation) extinct, 1801 |
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| | | | John Henry Petty 1765–1809 2nd Marquess of Lansdowne, etc., 3rd Earl of Shelburne, etc. | | Henry Petty-Fitzmaurice 1780–1863 3rd Marquess of Lansdowne, etc., 4th Earl of Shelburne, etc., 4th Earl of Kerry, 24th Baron Kerry | | Margaret Mercer Elphinstone 1788–1867 Comtesse de Flahaut, 2nd Baroness Keith (Ire, UK), 7th Lady Nairne |
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| | | | William Thomas Petty-FitzMaurice 1811–1836 styled Earl of Kerry | | Henry Thomas Petty-Fitzmaurice 1816–1866 4th Marquess of Lansdowne, etc., 5th Earl of Shelburne, etc., 5th Earl of Kerry, 24th Baron Kerry | | Emily Jane Petty-FitzMaurice 1819–1895 8th Lady Nairne |
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Baron Mersey, 1910 Viscount Mersey, 1916 | | | | | | | | | | | | | | | Baron Fitzmaurice, 1906 |
John Charles Bigham 1840–1929 1st Viscount Mersey, etc. | | | | | | Henry Charles Keith Petty-Fitzmaurice 1845–1927 5th Marquess of Lansdowne, etc., 6th Earl of Shelburne, etc., 6th Earl of Kerry, 24th Baron Kerry, 9th Lord Nairne | | | | | | Edmond Fitzmaurice 1846–1935 Baron Fitzmaurice |
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Charles Clive Bigham 1872–1956 2nd Viscount Mersey, etc. | | | | | | Henry William Edmund Petty-Fitzmaurice 1872–1936 6th Marquess of Lansdowne, etc., 7th Earl of Shelburne, etc., 7th Earl of Kerry, 25th Baron Kerry, 10th Lord Nairne | | Charles Fitzmaurice 1874–1914 |
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Edward Clive Bigham 1906–1979 3rd Viscount Mersey, etc. | | Katherine Bigham 1912–1995 12th Lady Nairne | | Charles Hope Petty-Fitzmaurice 1917–1944 7th Marquess of Lansdowne, etc., 8th Earl of Shelburne, etc., 8th Earl of Kerry, 26th Baron Kerry, 11th Lord Nairne | | George John Charles Mercer Nairne Petty-Fitzmaurice 1912–1999 8th Marquess of Lansdowne, etc., 9th Earl of Shelburne, etc., 9th Earl of Kerry, 27th Baron Kerry |
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| | | | Richard Maurice Clive Bigham 1934–2006 4th Viscount Mersey, etc., 13th Lord Nairne | | David Edward Hugh Bigham b. 1938 | | Charles Maurice Petty-Fitzmaurice b. 1941 9th Marquess of Lansdowne, etc., 10th Earl of Shelburne, etc., 10th Earl of Kerry, 28th Baron Kerry |
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| | | | Edward John Hallam Bigham b. 1966 5th Viscount Mersey, etc., 14th Lord Nairne | | Charles Richard Petty Bigham b. 1967 Heir presumptive to the Viscountcy Mersey | | Simon Henry George Petty-Fitzmaurice b. 1970 styled Earl of Kerry |
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| | | | Flora Bigham b. 2003 styled Mistress of Nairne | | | | | | George Henry Charles Petty-Fitzmaurice b. 2020 styled Viscount Calne and Calston |