Question: Who is Henry O'Brien, 7Th Earl Of Thomond's paternal grandfather?
Sentence (from "Barnabas O'Brien, 6th Earl of Thomond"): Barnabas O'Brien, 6th Earl of Thomond (died November 1657), son of Donogh O'Brien, 4th Earl of Thomond; succeeded his brother as earl, 1639; was lord-lieutenant of Clare, 1640–41:
Relevant evidence: Yes