6. Tyrant of Megalopolis in the reign of Antigonus Gonatas, and shortly before the formation of the Achaean league.
He was a native of Phigalea and a son of Artyla.
He was one of those tyrants who were set up at that time in various parts of Greece through Macedonian influence. he was honoured by the surname Χρηστός
In his reign, Cleomenes of Sparta and his eldest son Acrotatus invaded the territory of Megalopolis.
A battle was fought, in which Aristodemlus defeated the enemy and Acrotatus was slain. (Paus. 8.27.8
.) Aristodemus was assassinated afterwards by the emissaries of Ecdemus and Demophanes, two patriotic citizens of Megalopolis, and friends of young Philopoemen. (Plut. Phil. 1
.) His sepulchral mound in the neighbourhood of Megalopolis was seen as late as the time of Pausanias. (8.36.3.)