[Ir., feat-performing one].
In the Fenian Cycle he is the son of the King of the Tír Tairngire [Land of Promise] and father of the unnamed beloved of the warrior Cáel. He first appears in narrative as the Giolla Deacair or ‘Hard Gilly’. His daughter Aífe (6) was changed into a heron by a jealous rival, Iuchra (2). The name is sometimes also applied to Céadach. Abartach yields the ModIr. surname O'Haverty.