What is "amythaon"

In Greek mythology, Amythaon (; , gen.: Ἀμυθάονος) was a son of Cretheus and Tyro and brother of Aeson and Pheres. He dwelt at Pylos in Messenia, and by Idomene, his niece, or by Aglaia became the father of Bias, Melampus, and Aeolia. His wife Idomene is sometimes said to be daughter of Abas, king of Argos. According to Pindar, he and several other members of his family went to Iolcus to intercede with Pelias on behalf of Jason. Pausanias mentions him among those to whom the restoration of the Olympic Games was ascribed. A part of Elis was thought to have been named Amythaonia after him.