Dui Ladrach, son of Fíachu Tolgrach, was, according to medieval Irish legend and historical tradition, a High King of Ireland.
He helped his father kill the High King Art mac Lugdach, then helped Airgetmar take the throne by killing Art's son Ailill Finn and grandson Eochu mac Ailella.
The Lebor Gabála synchronises his reign with that of Artaxerxes III of Persia (358–338 BC).
[3] His son was Eochu Buadach, who was the father of High King Ugaine Mor Mac Eochach.
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