| Charles Henry O'Neill |
O'Neill (Earldom) |
Thu 28th Aug 1800 |
Thu 25th Mar 1841 |
| Robert Walpole |
of Orford (Earldom) |
Tue 6th Feb 1742 |
Thu 18th Mar 1745 |
| Robert Walpole |
of Orford (Earldom) |
Thu 18th Mar 1745 |
Wed 31st Mar 1751 |
| James Wandesford Butler |
of Ormond (Marquessate) |
Wed 5th Oct 1825 |
Fri 18th May 1838 |
| James Hubert Theobald Charles Butler |
of Ormond (Marquessate) |
Sat 17th Apr 1971 |
Sat 25th Oct 1997 |
| Richard Onslow |
Onslow (Barony) |
Fri 19th Jun 1716 |
Sun 5th Dec 1717 |
| George Onslow |
Onslow (Barony) |
Tue 8th Oct 1776 |
Tue 17th May 1814 |
| Rupert Charles William Bullard Onslow |
Onslow (Barony) |
Sat 14th May 2011 |
|
| Michael William Coplestone Dillon Onslow |
Onslow (Barony) |
Thu 3rd Jun 1971 |
Sat 14th May 2011 |
| Francis Vernon |
Orwell (Viscountcy) |
Sun 21st Jul 1776 |
Wed 15th Oct 1783 |
| James Fitzgerald |
of Offaly (Earldom) |
Thu 19th Mar 1761 |
Fri 19th Nov 1773 |
| Charles William Fitzgerald |
of Offaly (Earldom) |
Sat 10th Oct 1874 |
Thu 10th Feb 1887 |
| Gerald FitzGerald |
of Offaly (Earldom) |
Mon 8th Mar 1976 |
Fri 3rd Dec 2004 |
| Francis Vernon |
Orwell (Barony) |
Wed 7th Apr 1762 |
Wed 15th Oct 1783 |
| Robert Henley Ongley |
Ongley (Barony) |
Tue 30th Jul 1776 |
Sun 23rd Oct 1785 |
| Malcolm Ian Offord |
Offord of Garvel, of Greenock in the County of Renfrewshire (Barony) |
Wed 13th Oct 2021 |
|
| George |
Ockingham (Barony) |
Wed 6th Apr 1689 |
Sun 28th Oct 1708 |
| Richard Parsons |
Oxmantown (Barony) |
Wed 2nd Jul 1681 |
Tue 30th Jan 1703 |
| Walter Butler |
of Ormond (Marquessate) |
Fri 12th Jan 1816 |
Thu 10th Aug 1820 |
| Laurence Harman Harman |
Oxmantown (Viscountcy) |
Fri 2nd Oct 1795 |
Mon 20th Apr 1807 |