Duncannon (Viscountcy)
A peerage of the Kingdom of Ireland.
Letters patent issued on Sun 28th Feb 1723
To William Ponsonby as Promotion in the peerage of Ireland.
Holders
| Number | Surname | Forenames | Held from | Held to |
|---|---|---|---|---|
| 1st | Ponsonby | William | Sun 28th Feb 1723 | Fri 17th Nov 1724 |
| 2nd | Ponsonby | Brabazon | Fri 17th Nov 1724 | Tue 4th Jul 1758 |
| 3rd | Ponsonby | William | Tue 4th Jul 1758 | Mon 11th Mar 1793 |
| 4th | Ponsonby | Frederick | Mon 11th Mar 1793 | Sat 3rd Feb 1844 |
| 5th | Ponsonby | John William | Sat 3rd Feb 1844 | Sun 16th May 1847 |
| 6th | Ponsonby | John George Brabazon | Sun 16th May 1847 | Wed 28th Jan 1880 |
| 7th | Ponsonby | Frederick George Brabazon | Wed 28th Jan 1880 | Mon 11th Mar 1895 |
| 8th | Ponsonby | Walter William Brabazon | Mon 11th Mar 1895 | Sat 24th Feb 1906 |
| 9th | Ponsonby | Edward | Sat 24th Feb 1906 | Wed 1st Dec 1920 |
| 10th | Ponsonby | Vere Brabazon | Wed 1st Dec 1920 | Sat 10th Mar 1956 |
| 11th | Ponsonby | Frederick Edward Neuflize | Sat 10th Mar 1956 | Sun 5th Dec 1993 |
| 12th | Ponsonby | Arthur Mountifort Longfield | Sun 5th Dec 1993 | Fri 5th Apr 2002 |