| Ardelve (Barony) |
Kenneth Mackenzie - Tue 18th Nov 1766
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| Arden (Barony) |
Catherine Perceval - Wed 23rd May 1770
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| of Ardglass (Earldom) |
Thomas Cromwell - Sat 15th Apr 1645
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| of Armagh (Earldom) |
Ernest Augustus - Wed 24th Apr 1799
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28 March 1919 |
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| of Arran (Earldom) |
Arthur Gore - Mon 12th Apr 1762
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| of Arran (Earldom) |
Charles Butler - Mon 8th Mar 1694
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| of Arran (Earldom) |
Richard Butler - Sat 13th May 1662
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| Ashbrook (Viscountcy) |
Henry Flower - Thu 30th Sep 1751
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| Ashtown (Barony) |
Frederick Trench - Sat 27th Dec 1800
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| of Athlone (Earldom) |
Godard van Reede - Tue 4th Mar 1692
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21 May 1844 |
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| Athlumney (Barony) |
William Meredyth Somerville - Mon 14th Dec 1863
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| Auckland (Barony) |
William Eden - Fri 18th Sep 1789
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| Audley (Barony) |
George Tuchet - Tue 6th Sep 1616
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22 April 1777 |
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| Aungier (Barony) |
Francis Aungier - Tue 29th Jun 1621
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| Avonmore (Viscountcy) |
Barry Yelverton - Thu 1st Jan 1801
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| Aylmer (Barony) |
Matthew Aylmer - Sun 1st May 1718
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| Balfour (Barony) |
James Balfour - Fri 8th Nov 1619
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| Ballymote (Barony) |
John Taaffe - Tue 1st Aug 1628
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28 March 1919 |
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| Baltimore (Barony) |
George Calvert - Sun 16th Feb 1625
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| Baltinglass (Barony) |
John Stratford - Sat 21st May 1763
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