Fíachu Tolgrach, son of Muiredach Bolgrach, was a legendary High King of Ireland, according to some medieval and early modern Irish sources.
In the Lebor Gabála Érenn he is not a High King: he kills the former High King Art mac Lugdach, but during the reign of Art's son Ailill Finn he is killed in battle against Airgetmar.
[1] However, in Geoffrey Keating's Foras Feasa ar Éirinn[2] and the Annals of the Four Masters[3] he succeeds Art as High King and rules for seven or ten years, until he is killed by Ailill Finn, who succeeds him.
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