Echemus

King of Tegea in Arcadia, son of Aeropus, champion of the Peloponnesian alliance against the first Heraclid invasion under Hyllus. Herodotus 9.26 puts the canonical version of the episode into the mouth of the Tegean envoys at the Plataea war-council in 479 BC: when the Heraclidae came north of the Isthmus, Echemus met Hyllus in single combat to settle the whole question of the Peloponnese. Echemus killed Hyllus, and the Heraclidae withdrew for a generation under the sworn terms (fifty years in the minority tradition; a hundred in Diodorus 4.58.4; unspecified in Herodotus). Pausanias 8.5.1 still walked Echemus's tomb at Tegea in the second century AD, with a relief of the single combat carved into its plinth.