George III , monarch of the United Kingdom
1 January 1801 until 29 January 1820.
Letters Patent for this reign
| Kingdom | Reign | Issued on | Peerage types | Peerages | Issued to |
|---|---|---|---|---|---|
| Kingdom of Ireland | George III | Fri 2nd Jan 1801 | Hereditary peerage subsidiary to another created by the same letters patent, Promotion in the peerage of Ireland | Castlerosse, Kenmare | BROWNE Valentine |
| United Kingdom | George III | Mon 7th Sep 1812 | Promotion, Promotion | Harewood, Lascelles | LASCELLES Edward |
| United Kingdom | George III | Thu 13th Feb 1817 | Promotion, Promotion, Promotion | Hastings, Loudoun, Rawdon | RAWDON-HASTINGS Francis |
| Kingdom of Ireland | George III | Fri 18th May 1810 | Peerage of Ireland | Kiltarton | PRENDERGAST SMYTH John |
| Kingdom of Ireland | George III | Thu 8th Jan 1801 | Promotion in the peerage of Ireland | Kilwarden | WOLFE Arthur |
| United Kingdom | George III | Sat 1st Sep 1804 | Hereditary peerage | Lake | LAKE Gerard |
| United Kingdom | George III | Wed 4th Nov 1807 | Promotion | Lake | LAKE Gerard |
| United Kingdom | George III | Sat 22nd Feb 1806 | Hereditary peerage (already peer of Scotland) | Lauderdale | MAITLAND James |
| Kingdom of Ireland | George III | Thu 20th Jan 1803 | Promotion in the peerage of Ireland | Limerick | PERY Edmund Henry |
| Kingdom of Ireland | George III | Sat 24th May 1806 | Promotion in the peerage of Ireland | Lismore | O'CALLAGHAN Cornelius |
| United Kingdom | George III | Mon 19th Jan 1801 | Hereditary peerage (already peer of Ireland) | Loftus | TOTTENHAM LOFTUS Charles |
| Kingdom of Ireland | George III | Sat 13th Jan 1816 | Promotion in the peerage of Ireland | Londonderry | STEWART Robert |
| Kingdom of Ireland | George III | Fri 2nd Jan 1801 | Promotion in the peerage of Ireland | Longueville | LONGFIELD Richard |
| United Kingdom | George III | Tue 7th Apr 1807 | Promotion | Lonsdale | LOWTHER William |
| Kingdom of Ireland | George III | Wed 28th May 1806 | Promotion in the peerage of Ireland | Lorton | KING Robert Edward |
| United Kingdom | George III | Tue 17th May 1814 | Hereditary peerage | Lynedoch | GRAHAM Thomas |
| United Kingdom | George III | Mon 20th Apr 1807 | Hereditary peerage | Manners | MANNERS SUTTON Thomas |
| United Kingdom | George III | Wed 9th Apr 1806 | Promotion | Manvers | PIERREPONT Charles |
| United Kingdom | George III | Mon 22nd Jun 1801 | Promotion, Promotion | Marsham, Romney | MARSHAM Charles |
| United Kingdom | George III | Fri 11th Aug 1815 | Hereditary peerage (already peer of Ireland) | Melbourne | LAMB Peniston |