 The most important however was the founder's grandson Cleisthenes, the grandfather of the Athenian legislator Cleisthenes, who ruled from 600 to 560 BC.Besides reforming the city's constitution to the advantage of the Ionians and replacing Dorian cults with the worship of Dionysus, Cleisthenes gained a reputation as the chief instigator and general of the First Sacred War (590 BC) in the interests of the Delphians.His successor Aeschines was expelled by the Spartans in 556 BC and Sicyon became an ally of the Lacedaemonians for more than a century.