 Even this time democracy did not last more than a few years, and in 264 BC Cleinias was slain by his cognate Abantidas, who established his tyranny for twelve years.In 252 BC Abantidas was murdered by two rhetoricians, Aristotle the Dialectician and Deinias of Argos, and his father Paseas took over, only to be murdered after a short rule by another rival named Nicocles.In 251 Aratus of Sicyon, the 20-year-old son of Cleinias, conquered the city with a night assault and expelled the last tyrant.