Fianna
In Celtic mythology, the Fianna were Irish warriors who served the High King of Ireland. In the AD 3rd century, their adventures were recorded in the Fenian Cycle[?]. Their last leader was Finn mac Cumhail.
Fianna:
Alternatives: Champions of the Red Branch, Fenians, Fianna Éireann
Fianna is used in the name of one of the major Irish political parties, Fianna Fáil.