Fiatach Finn mac Dáire, a distant descendant of ÃÂengus Tuirmech Temrach, was, according to medieval Irish legend and historical tradition, a king of the Ulaid, later a High King of Ireland, and the eponymous ancestor of the early Medieval Ulster dynasty of the Dál Fiatach. He was king of the Ulaid while Feradach Finnfechtnach was High King, and succeeded to the High Kingship himself when Feradach died. He ruled for three years until he was killed by FÃÂachu Finnolach. The Lebor Gabála ÃÂrenn synchronises his reign with that of the Roman emperor Nerva (AD 96âÂÂ98). The chronology of Geoffrey Keating's Foras Feasa ar ÃÂirinn dates his reign to AD 25âÂÂ28, that of the Annals of the Four Masters to AD 36âÂÂ39.
Fiatach Finn mac Dáire was also a cousin of the legendary Cú Roàmac Dáire and Conaire Mór of the ÃÂrainn and Dáirine (Clanna Dedad). The Dál Fiatach are said to descend from the "Family of Cú RoÃÂ" in the Book of Glendalough (Rawlinson B 502).