The city of Athens (, Athênai [a.tʰɛ̂ː.nai̯]; Modern Greek: Αθήναι, Athine or, more commonly and in singular, Αθήνα, Athina [a.'θi.na]) during the classical period of ancient Greece (480–323 BC) was the major urban centre of the notable polis (city-state) of the same name, located in 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 Isagoras. This system remained remarkably stable, and with a few brief interruptions remained in place for 180 years, until 322 BC (aftermath of Lamian War). The peak of Athenian hegemony was achieved in the 440s to 430s BC, known as the Age of Pericles. In the classical period, Athens was a centre for the arts, learning and philosophy, home of Plato's Academy and Aristotle's Lyceum, Athens was also the birthplace of Socrates, Plato, Pericles, Aristophanes, Sophocles, and many other prominent philosophers, writers and politicians of the ancient world. It is widely referred to as the cradle of Western Civilization, and the birthplace of democracy, largely due to the impact of its cultural and political achievements during the 5th and 4th centuries BC on the rest of the then-known European continent. History Rise to power (508–448 BC) Hippias, son of Peisistratus, had ruled Athens jointly with his brother, Hipparchus, from the death of Peisistratus in about 527. Following the assassination of Hipparchus in about 514, Hippias took on sole rule, and in response to the loss of his brother, became a worse leader who was increasingly disliked. Hippias exiled 700 of the Athenian noble families, amongst them Cleisthenes' family, the Alchmaeonids. Upon their exile, they went to Delphi, and Herodotus says they bribed the Pythia always to tell visiting Spartans that they should invade Attica and overthrow Hippias. That supposedly worked after a number of times, and Cleomenes I led a Spartan force to overthrow Hippias, which succeeded, and instated an oligarchy. Cleisthenes disliked the Spartan rule, along with many other Athenians, and so made his own bid for power. The result was democracy in Athens, but considering Cleisthenes' motivation for using the people to gain power, as without their support, he would have been defeated, and so Athenian democracy may be tainted by the fact its creation served greatly the man who created it. The reforms of Cleisthenes replaced the traditional four Ionic "tribes" (phyle) with