Augeas, a legendary king of Elis, Greece. He was one of the Argonauts, and he possessed 3,000 oxen, which he kept for thirty years without cleansing their stalls. Heracles undertook the task on condition that he should receive a tenth of the herd as his reward. By diverting the river Alpheus he easily got rid of the accumulated filth, but Augeas declined to keep his bargain. The hero accordingly killed him. The cleansing of the Augean stable has become a proverbial expression for any difficult and unsavoury undertaking.