| of Lansdowne (Marquessate) |
William Petty - Mon 6th Dec 1784
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| Lansdowne (Barony) |
George Granville - Fri 1st Jan 1712
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- |
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| Launceston (Viscountcy) |
Frederick Lewis - Fri 26th Jul 1726
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25 October 1760 |
| Lechmere (Barony) |
Nicholas Lechmere - Thu 4th Sep 1721
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- |
| of Leicester (Earldom) |
George Townshend - Tue 18th May 1784
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31 December 1855 |
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| of Leicester (Earldom) |
Thomas Coke - Sat 9th May 1744
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| Leinster (Viscountcy) |
James Fitzgerald - Tue 21st Feb 1747
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- |
| Lewisham (Viscountcy) |
William Legge - Sat 5th Sep 1711
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- |
| Ligonier (Barony) |
John Ligonier - Wed 27th Apr 1763
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- |
- |
| Ligonier (Earldom) |
John Ligonier - Wed 10th Sep 1766
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| Lilford (Barony) |
Thomas Powys - Thu 26th Oct 1797
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| of Liverpool (Earldom) |
Charles Jenkinson - Wed 1st Jun 1796
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| Longford (Barony) |
Jacob Bouverie - Thu 29th Jun 1747
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| Lonsdale (Viscountcy) |
James Lowther - Mon 24th May 1784
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24 May 1802 |
- |
| of Lonsdale (Earldom) |
James Lowther - Mon 24th May 1784
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24 May 1802 |
- |
| Loughborough (Barony) |
Alexander Wedderburn - Wed 14th Jun 1780
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2 January 1805 |
- |
| Loughborough (Barony) |
Alexander Wedderburn - Sat 31st Oct 1795
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| Lovaine (Barony) |
Hugh Percy - Wed 28th Jan 1784
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| Lovel (Barony) |
Thomas Coke - Fri 28th May 1728
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| Lovel and Holland (Barony) |
John Perceval - Fri 7th May 1762
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