Mongfind

Queen Mongfind ("fair mane") was the wife, of apparent Munster origins, of the legendary Irish High King Eochaid Mugmedón and mother of his eldest three sons, Brión, Ailill and Fiachrae, ancestors of the historical Connachta, through whom she is an ancestor of many Irish and European nobility today. She was the sister of Crimthann mac Fidaig, King of Munster and the next High King of Ireland, whom she is said to have killed with poison in the attempt to have the kingdom for her sons. She drank the same to convince him, and died soon after at Samhain, becoming a goddess of sorcery.