| John Charles Wallop |
of Portsmouth (Earldom) |
Tue 16th May 1797 |
Thu 14th Jul 1853 |
| Isaac Newton Wallop |
of Portsmouth (Earldom) |
Mon 9th Jan 1854 |
Sun 4th Oct 1891 |
| John Fellowes Wallop |
of Portsmouth (Earldom) |
Tue 4th Dec 1917 |
Mon 7th Sep 1925 |
| Oliver Henry Wallop |
of Portsmouth (Earldom) |
Mon 7th Sep 1925 |
Tue 9th Feb 1943 |
| Henry Herbert |
Porchester (Barony) |
Tue 17th Oct 1780 |
Mon 3rd Jun 1811 |
| George Reginald Oliver Molyneux Herbert |
Porchester (Barony) |
Tue 11th Sep 2001 |
|
| Henry George Alfred Marius Victor Francis Herbert |
Porchester (Barony) |
Thu 5th Apr 1923 |
Tue 22nd Sep 1987 |
| Henry George Reginald Molyneux Herbert |
Porchester (Barony) |
Tue 22nd Sep 1987 |
Tue 11th Sep 2001 |
| Henry George Herbert |
Porchester (Barony) |
Mon 3rd Jun 1811 |
Tue 16th Apr 1833 |
| Henry John George Herbert |
Porchester (Barony) |
Tue 16th Apr 1833 |
Mon 10th Dec 1849 |
| Henry Howard Molyneux Herbert |
Porchester (Barony) |
Mon 10th Dec 1849 |
Sat 28th Jun 1890 |
| George Edward Stanhope Molyneux Herbert |
Porchester (Barony) |
Sat 28th Jun 1890 |
Thu 5th Apr 1923 |
| Henry Bentinck |
of Portland (Dukedom) |
Mon 6th Jul 1716 |
Thu 4th Jul 1726 |
| William John Arthur Charles James Cavendish-Bentinck |
of Portland (Dukedom) |
Sat 6th Dec 1879 |
Mon 26th Apr 1943 |
| William Arthur Henry Cavendish-Bentinck |
of Portland (Dukedom) |
Mon 26th Apr 1943 |
Mon 21st Mar 1977 |
| Victor Frederick William Cavendish-Bentinck |
of Portland (Dukedom) |
Sat 13th Dec 1980 |
Mon 30th Jul 1990 |
| William Bentinck |
of Portland (Dukedom) |
Thu 4th Jul 1726 |
Sat 1st May 1762 |
| William Henry Cavendish Cavendish-Bentinck |
of Portland (Dukedom) |
Sat 1st May 1762 |
Mon 30th Oct 1809 |
| William Henry Cavendish Cavendish-Scott-Bentinck |
of Portland (Dukedom) |
Mon 30th Oct 1809 |
Mon 27th Mar 1854 |
| William John Cavendish-Scott-Bentinck |
of Portland (Dukedom) |
Mon 27th Mar 1854 |
Sat 6th Dec 1879 |