Fedlimid Rechtmar ("the lawful, legitimate" or "the passionate, furious") or
Rechtaid ("the judge, lawgiver") son of
Tuathal Techtmar, was, according to medieval Irish legend and historical tradition, a
High King of Ireland. His mother was Báine, daughter of Scál. He took power after killing his predecessor, and his father's killer,
Mal mac Rochride. He is said to have instituted the principle of
an eye for an eye into Irish law, after which the behaviour of the Irish improved. The completion of the road construction around
Tara is attributed to him. He ruled for nine or ten years before dying in his bed, and was succeeded by
Cathair Mór. One of his sons,
Conn Cétchathach, would succeed Cathair. Two other sons, Fiacha Suighe, ancestor of the
Dal Fiachrach Suighe, and Eochaid Finn, are named in medieval sources. The
Lebor Gabála Érenn synchronises his reign with that of the
Roman emperor Marcus Aurelius (161–180). The chronology of
Geoffrey Keating's
Foras Feasa ar Éirinn dates his reign to 104–113, that of the
Annals of the Four Masters to 110–119.