1. One of the Heracleidae, father of Eurysthenēs and Proclēs.
2. The only one of Leonidas' three hundred Spartans to return home after the battle of Thermopylae (480 BC), having missed the fighting through sickness. He was disfranchised, and according to Herodotus (7. 230), ‘no man would give him a light for his fire or speak to him; he was called Aristodemus the coward.’ At the battle of Plataea in the following year he redeemed himself by fighting recklessly to the death.
3. Legendary Messenian hero of the First Messenian War against Sparta. He killed his daughter in consequence of an oracle which said that the sacrifice of a maiden would ensure the preservation of Messenia. He became king and was at first victorious over the Lacedaemonians, but later, despairing of ultimate success, committed suicide over his daughter's grave.
In Greek mythology, Aristodemus (Ancient Greek: Ἀριστόδημος) was an Heracleidae, son of Aristomachus and brother of Cresphontes and Temenus. He was a great-great-grandson of Heracles and helped lead the fifth and final attack on Mycenae in the Peloponnesus.
Aristodemus and his brothers complained to the Oracle that its instructions had proved fatal to those who had followed them (the Oracle had told Hyllas to attack through the narrow passage when the third fruit was ripe). They received the answer that by the "third fruit" the "third generation" was meant, and that the "narrow passage" was not the isthmus of Corinth, but the straits of Rhium. They accordingly built a fleet at Naupactus, but before they set sail, Aristodemus was struck by lightning (or shot by Apollo) and the fleet destroyed, because one of the Heraclidae had slain an Acarnanian soothsayer.
His brothers were later able to conquer the Peloponessus (see Heracleidae).
By his wife Argia, daughter of King Autesion of Thebes, he was the father of twin Kings Eurysthenes and Procles, the ancestors of the two royal houses of Sparta.[1]
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