In 251, Aratus of Sicyon, the 20-year-old son of Cleinias, conquered the city with a night assault and expelled the last tyrant. Aratus re-established democracy, called back the exiles and brought his city into the Achaean League. This move ended the internal strife and Aratus remained the leading figure of Achaean politics until his death in 213 BC, during a period of great achievements. The prosperity and peaceful condition of Sicyon was only interrupted by an Aetolian raid in 241 BC and an unsuccessful siege at the hands of king Cleomenes III of Sparta in early 224 BC.
In 251, Aratus of Sicyon, the 20-year-old son of Cleinias, conquered the city with a night assault and expelled the last tyrant. Aratus re-established democracy, called back the exiles and brought his city into the Achaean League. This move ended the internal strife and Aratus remained the leading figure of Achaean politics until his death in 213 BC, during a period of great achievements. The prosperity and peaceful condition of Sicyon was only interrupte.d by an Aetolian raid in 241 BC and an unsuccessful siege at the hands of king Cleomenes III of Sparta in early 224 BC.