The city of Athens during the classical period of Ancient Greece (508–322 BC) was a notable polis of Attica, Greece, leading the Delian League in the Peloponnesian War against Sparta and the Peloponnesian League. Athenian democracy was established in 508 BC under Cleisthenes following the tyranny of Hippias. This system remained remarkably stable, and with a few brief interruptions remained in place for 180 years, until 322 BC.