Question: What country do this social and ethnic group, to which William Stewart, 1st Viscount Mountjoy belongs and that are mostly the descendants and successors of the English Protestant Ascendancy, live?
Sentence (from "Anglo-Irish people"): They mostly belong to the Anglican Church of Ireland, which was the established church of Ireland until 1871, or to a lesser extent one of the English dissenting churches, such as the Methodist church, though some were also Catholic.
Relevant evidence: No