1. A son of Actor, and father of Eurydamas and Eurytion. He propitiated Peleus for the murder of his brother; but during the chase of the Calydonian boar, Peleus unintentionally killed Eurytion, the son of Irus. Peleus endeavoured to soothe him by offering him his flocks ; but Irus would not accept them, and at the command of an oracle, Peleus allowed them to run wherever they pleased. A wolf devoured the sheep, but was thereupon changed into a stone, which was shown in later times on the frontier between Locris and Phocis. (Anton. Lib. 38; Tzetz. ad Lycoph. 175; Schol. ad Apollon. Rhod. i. 71.)

2. The well-known beggar of Ithaca, who was celebrated for his voracity. His real name was Arnaeus, but he was called Irus because he was employed by the suitors of Penelope as the messenger; for Irus, according to the lexicographers, signifies a messenger. (Hom. Od. xviii. 5, &c., 239.)