O'Brien, of Kilfenora in the County of Clare (Barony)
A peerage of the United Kingdom.
Letters patent issued on Sat 16th Jun 1900
To Peter O'Brien as Hereditary peerage.
|Number||Surname||Forenames||Held from||Held to|
|1st||O'Brien||Peter||Sat 16th Jun 1900||Mon 7th Sep 1914|
Peerage extinct on Mon 7th Sep 1914 with the 1st holder .