Question: Who is the paternal grandfather of Bres Rí?
Sentence (from "Art Imlech"): Art Imlech, ("having an edge or border" or "bordering on a lake or marsh") son of Elim Olfínechta, was, according to medieval Irish legend and historical tradition, a High King of Ireland, who took power after killing his predecessor, and his father's killer, Gíallchad.
Relevant evidence: Yes