Being defeated by Lucius Mummius Achaicus before the walls of the city in the Battle of Korinth (146 BC), Diaios made no further attempt to defend the city, but fled to Megalopolis, where he slew his wife to prevent her being captured by the enemy and then killed himself by poisoning. His death marked the end of the Achaian League as it was then dissolved by Lucius Mummius.