In Greek mythology, Phegeus (Ancient Greek: Φηγεύς, romanized: Phegeus) was the king of Psophis in Arcadia who purified Alcmaeon after the murder of his own mother, Eriphyle. The town of Phegeia, which had before been called Erymanthus, was believed to have derived its name from him. Subsequently, however, it was changed again into Psophis.[1]