| of Abercorn (Marquessate) |
John James Hamilton - Fri 15th Oct 1790
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| of Abercorn (Earldom) |
James Hamilton - Mon 10th Jul 1606
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| of Aberdeen and Temair (Marquessate) |
John Campbell Gordon - Sat 15th May 1915
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| of Abergavenny (Marquessate) |
William Nevill - Fri 14th Jan 1876
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| of Abergavenny (Earldom) |
George Nevill - Mon 17th May 1784
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| of Abingdon (Earldom) |
James Bertie - Mon 30th Nov 1682
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| Adbaston (Barony) |
Charles Whitworth - Sat 25th Nov 1815
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13 May 1825 |
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| Addison (Viscountcy) |
Christopher Addison - Mon 2nd Jul 1945
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| of Ailesbury (Earldom) |
Robert Bruce - Wed 18th Mar 1665
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10 February 1747 |
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| of Ailesbury (Marquessate) |
Charles Brudenell-Bruce - Tue 17th Jul 1821
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| of Ailesbury (Earldom) |
Thomas Brudenell-Bruce - Mon 10th Jun 1776
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| of Ailsa (Marquessate) |
Archibald Kennedy - Sat 10th Sep 1831
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| of Airlie (Earldom) |
James Ogilvy - Sat 2nd Apr 1639
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| Alanbrooke (Viscountcy) |
Alan Francis Brooke - Tue 29th Jan 1946
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10 January 2018 |
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| Alexander of Hillsborough (Earldom) |
Albert Victor Alexander - Wed 30th Jan 1963
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11 January 1965 |
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| Alexander of Tunis (Earldom) |
Harold Rupert Leofric George Alexander - Tue 11th Mar 1952
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| Alford (Viscountcy) |
John Cust - Mon 27th Nov 1815
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17 March 1921 |
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| Allendale (Viscountcy) |
Wentworth Canning Blackett Beaumont - Wed 5th Jul 1911
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| Alverstone (Viscountcy) |
Richard Everard Webster - Mon 24th Nov 1913
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15 December 1915 |
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| Amherst (Earldom) |
William Pitt Amherst - Tue 19th Dec 1826
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4 March 1993 |
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