Tadcaster (Viscountcy)
A peerage of the Kingdom of Great Britain.
Letters patent issued on Fri 19th Oct 1714
To Henry O'Brien as Hereditary peerage (already peer of Ireland).
Holders
| Number | Surname | Forenames | Held from | Held to |
|---|---|---|---|---|
| 1st | O'Brien | Henry | Fri 19th Oct 1714 | Thu 20th Apr 1741 |
Peerage extinct on Thu 20th Apr 1741 with the 1st holder .