Letters Patent for the Kingdom of Ireland
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By title: O
All letters patent for Kingdom of Ireland
| Kingdom | Reign | Issued on | Peerage types | Peerages | Issued to |
|---|---|---|---|---|---|
| Kingdom of Ireland | Charles II | Wed 21st Oct 1654 | Hereditary peerage subsidiary to another created by the same letters patent | O'Brien | O'BRIEN Murrough |
| Kingdom of Ireland | George III | Thu 19th Mar 1761 | Hereditary peerage subsidiary to another created by the same letters patent | Offaly | FITZGERALD James |
| Kingdom of Ireland | Charles I | Sat 23rd Dec 1645 | Peerage of Ireland | Ogle | OGLE William |
| Kingdom of Ireland | William IV | Thu 6th Jan 1831 | Hereditary peerage subsidiary to another created by the same letters patent | O'Grady | O'GRADY Standish |
| Kingdom of Ireland | George III | Fri 25th Oct 1793 | Peerage of Ireland | O'Neill | O'NEILL John |
| Kingdom of Ireland | George III | Thu 28th Aug 1800 | Promotion in the peerage of Ireland | O'Neill | O'NEILL Charles Henry |
| Kingdom of Ireland | George III | Sat 3rd Oct 1795 | Promotion in the peerage of Ireland | O'Neill | O'NEILL John |
| Kingdom of Ireland | George III | Tue 30th Jul 1776 | Peerage of Ireland | Ongley | HENLEY ONGLEY Robert |
| Kingdom of Ireland | William IV | Wed 4th May 1836 | Peerage of Ireland | Oranmore and Browne | BROWNE Dominick |
| Kingdom of Ireland | George III | Sat 5th Jun 1790 | Peerage of Ireland | Oriel | FOSTER Margaretta Amelia |
| Kingdom of Ireland | George IV | Wed 5th Oct 1825 | Promotion in the peerage of Ireland | Ormond | BUTLER James Wandesford |
| Kingdom of Ireland | George III | Fri 12th Jan 1816 | Promotion in the peerage of Ireland | Ormond | BUTLER Walter |
| Kingdom of Ireland | Charles II | Wed 30th Mar 1661 | Promotion in the peerage of Ireland | Ormond | BUTLER James |
| Kingdom of Ireland | Charles I | Sat 30th Aug 1642 | Promotion in the peerage of Ireland | Ormond | BUTLER James |
| Kingdom of Ireland | Charles II | Sun 5th Sep 1660 | Promotion in the peerage of Ireland | Orrery | BOYLE Roger |
| Kingdom of Ireland | George III | Sun 21st Jul 1776 | Promotion in the peerage of Ireland | Orwell | VERNON Francis |
| Kingdom of Ireland | George III | Wed 7th Apr 1762 | Peerage of Ireland | Orwell | VERNON Francis |
| Kingdom of Ireland | George III | Sat 22nd Sep 1792 | Peerage of Ireland | Oxmantown | HARMAN Laurence Harman |
| Kingdom of Ireland | Charles II | Wed 2nd Jul 1681 | Hereditary peerage subsidiary to another created by the same letters patent | Oxmantown | PARSONS Richard |
| Kingdom of Ireland | George III | Fri 2nd Oct 1795 | Promotion in the peerage of Ireland | Oxmantown | HARMAN Laurence Harman |