[Ir., Blinder of Dedad].
King of Tara, son of Cairbre Losc, who, according to the usual story, blinded his brother Dedad lest he aspire to the throne himself. In a variant he is the foster-son, dalta, of Dedad. Daui reigned for seven years until he was assassinated. Medieval redactors attempted to prove that Daui's assassination was coeval with that of Julius Caesar.