Question: Who is the maternal grandmother of Thomas Butler, Viscount Thurles?
Sentence (from "Thomas Butler, Viscount Thurles"): Thomas Butler, Viscount Thurles (before 1596 – 15 December 1619) was the son and heir apparent of Walter Butler, 11th Earl of Ormond (1559 – 1632/3) (whom he predeceased) and Helen Butler.
Relevant evidence: Yes