He was the king of Oichalia. A great archer, he taught Heracles to use the bow.
He held an archery contest, to see who would marry his daughter Iole. The winner would have to defeat Eurytos himself to marry his daughter. Needing a wife, Heracles traveled to Oichalia and won the contest. Eurytos, however, refused to let his daughter be married to him. He feared another one of Heracles' fits of madness and his grandsons killed. His son, Iphitos, urged his father to reconsider.
While Heracles was still in the town, the famous thief Autolycus stole some cattle of Eurytos, which was blamed upon Heracles. Iphitos did not believe that Heracles was responsible. He went to Heracles, and asked his help in finding the cattle. Heracles agreed, but soon, in another fit of madness, he hurled Iphitos from the walls of the city, killing him.
Later, Heracles returned to Oichalia, to seek his revenge upon Eurytos. He attacked the town, killed Eurytos, and took Iole as his concubine. Deianeira, the wife of Heracles, became jealous of Iole, and accidentally poisoned her husband.