or Finn MacCool
Hero of the Irish Gaelic tales and ballads of the Fenian cycle .
He was chief of a band of warriors, the Fianna Éireann, who were skilled in poetry, hunting, and warfare and supposedly flourished in the 3rd century AD. In time, the king and people turned against the Fianna, and they were defeated in the Battle of Gabhra, which Finn's son Oisín survived.