| Marsham (Viscountcy) |
Charles Marsham - Mon 22nd Jun 1801
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- |
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| Martin of Springburn (Barony) |
Michael John Martin - Tue 25th Aug 2009
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29 April 2018 |
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| Martonmere (Barony) |
John Roland Robinson - Wed 13th May 1964
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- |
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| Maryborough (Barony) |
William Wellesley Pole - Tue 17th Jul 1821
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25 July 1863 |
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| Masham (Barony) |
Samuel Cunliffe Lister - Wed 15th Jul 1891
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4 January 1924 |
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| Masham (Barony) |
Samuel Masham - Fri 1st Jan 1712
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- |
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| Masham (Barony) |
Philip Cunliffe-Lister - Thu 5th May 1955
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| Masham of Ilton (Barony) |
Susan Lilian Primrose Cunliffe-Lister - Thu 12th Feb 1970
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12 March 2023 |
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| Mason of Barnsley (Barony) |
Roy Mason - Tue 20th Oct 1987
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19 April 2015 |
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| of Massereene (Earldom) |
Clotworthy Skeffington - Fri 16th Jul 1756
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25 February 1816 |
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| Massereene (Viscountcy) |
John Clotworthy - Sun 21st Nov 1660
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- |
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| Massey of Darwen (Barony) |
Doreen Elizabeth Massey - Mon 26th Jul 1999
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- |
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| Massy (Barony) |
Hugh Massy - Sun 4th Aug 1776
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- |
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| Mathers (Barony) |
George Mathers - Wed 30th Jan 1952
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26 September 1965 |
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| Matthews (Barony) |
Victor Collin Matthews - Tue 22nd Jul 1980
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5 December 1995 |
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| Maude of Horsham (Barony) |
Francis Anthony Aylmer Maude - Tue 26th May 2015
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- |
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| Maude of Stratford-upon-Avon (Barony) |
Angus Edmund Upton Maude - Mon 19th Sep 1983
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9 November 1993 |
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| Maugham (Barony) |
Frederic Herbert Maugham - Mon 7th Oct 1935
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23 March 1958 |
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| Maugham (Viscountcy) |
Frederic Herbert Maugham - Fri 22nd Sep 1939
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13 March 1981 |
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| Maule (Viscountcy) |
William Maule - Thu 2nd May 1743
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4 January 1782 |
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