Letters patent issued on Fri 19th Oct 1714

To Henry O'Brien

A peerage of the Kingdom of Great Britain , during the reign of George I

Previously known as Earl of Thomond in the Peerage of the Kingdom of Ireland.

Ordinality on date: 9

Person prefix:

Person suffix:

Previous of title: true


  1. Viscount Tadcaster


C 231/9, p. 319; 1 Geo. I, pt. 12 (C 66/3509) no. 21