Question: Who is the paternal grandfather of Domnall Gerrlámhach?
Sentence (from "Muirchertach Ua Briain"): Muircheartach Ua Briain (old spelling: Muirchertach Ua Briain) (also known as Murtough O'Brien) (c. 1050 – c. 10 March 1119), son of Toirdelbach Ua Briain and great-grandson of Brian Bóruma, was King of Munster and later self-declared High King of Ireland.
Relevant evidence: Yes