Fiacha Sraibhtine, son of Cairbre Lifechair, was, according to medieval Irish legend and historical tradition, a High King of Ireland. On his father's death, Fothad Cairpthech and Fothad Airgthech, sons of Lugaid mac Con, had taken the throne jointly, but within the year Fothad Airgthech killed his brother. FÃÂacha and the fianna then defeated and killed Fothad in the Battle of Ollarba.
FÃÂacha's son, Muiredach Tirech, commanded his armies, as the king himself was not allowed to go into battle. Once, Muiredach led a victorious expedition to Munster. The Three CollasâÂÂColla Uais, Colla Fo Chri and Colla Menn, sons of FÃÂacha's brother Eochaid DoimlénâÂÂgave battle to FÃÂacha while Muiredach and his army were still in Munster. FÃÂacha's druid, Dubchomar, prophesied that if FÃÂacha was to defeat the Collas, none of his descendants would ever rule Ireland, and likewise, if the Collas won, none of their descendants would be king after them. FÃÂacha was defeated and killed in what became known as the Battle of Dubchomar.
FÃÂacha had ruled for 31, 33, 36 or 37 years. The chronology of Geoffrey Keating's Foras Feasa ar ÃÂirinn dates his reign to 273âÂÂ306, the Annals of the Four Masters to 285âÂÂ322.