| Ligonier (Barony) |
John Ligonier - Wed 27th Apr 1763
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| Lismore (Barony) |
Cornelius O'Callaghan - Fri 6th Jul 1838
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29 October 1898 |
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| Loftus (Barony) |
Charles Tottenham Loftus - Mon 19th Jan 1801
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| Lovel and Holland (Barony) |
John Perceval - Fri 7th May 1762
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| Ludlow (Barony) |
George James Ludlow - Sat 10th Sep 1831
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16 April 1842 |
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| Lumley (Barony) |
Richard Lumley - Sat 31st May 1681
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| Lyttelton (Barony) |
William Henry Lyttelton - Wed 13th Aug 1794
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| Macartney (Barony) |
George Macartney - Wed 8th Jun 1796
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| Maynard (Barony) |
William Maynard - Tue 14th Mar 1628
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| Melbourne (Barony) |
Peniston Lamb - Fri 11th Aug 1815
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29 January 1853 |
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| Meredyth (Barony) |
William Meredyth Somerville - Thu 3rd May 1866
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8 January 1929 |
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| Mereworth (Barony) |
Geoffrey Henry Browne - Tue 19th Jan 1926
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| Milton (Barony) |
Joseph Damer - Mon 10th May 1762
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| Minster (Barony) |
Henry Conyngham - Tue 17th Jul 1821
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| Monck (Barony) |
Charles Stanley Monck - Thu 12th Jul 1866
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| Monckton (Barony) |
George Edmund Milnes Monckton-Arundell - Sat 2nd Jul 1887
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1 January 1971 |
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| Monteagle (Barony) |
John Denis Browne - Thu 20th Feb 1806
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| Moore (Barony) |
Charles Moore - Sat 17th Jan 1801
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29 June 1892 |
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| Moore (Barony) |
Henry Charles Ponsonby Moore - Sat 30th Jan 1954
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| Mountgarret (Barony) |
Henry Edmund Butler - Tue 20th Jun 1911
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