1. A son of Aristomachus, and a descendant of Heracles, was married to Argeia, by whom he became the father of Eurysthenes and Procles. According to some traditions Aristodemus was killed at Naupactus by a flash of lightning, just as he was setting out on his expedition into Peloponnesus (Apollod. ii. 8. § 2, &c.), or by an arrow of Apollo at Delphi because he had consulted Heracles about the return of the Heraclids instead of the Delphic oracle. (Paus. iii. 1. § 5.) According to this tradition, Eurysthenes and Procles were the first Heraclid kings of Lacedaemon; but a Lacedaemonian tradition stated, that Aristodemus himself came to Sparta, was the first king of his race, and died a natural death. (Herod, vi. 52; Xenoph. Agesil. 8. § 7.)

2. Another Heraclid of this name, the grandfather of the former, is mentioned by Euripides. (Ap. Schol. ad Pind. Isth. iv. 104.)