<Tr> <Td_colspan="2"> Historical era </Td> <Td> Classical antiquity </Td> </Tr> <Tr> <Td> </Td> <Td> Cleisthenes establishes Athenian democracy </Td> <Td> 508 BC </Td> </Tr> <Tr> <Td> </Td> <Td> Delian League </Td> <Td> 478--404 BC (404--403 BC Thirty tyrants) </Td> </Tr> <Tr> <Td> </Td> <Td> Second Athenian Empire </Td> <Td> 378--355 BC </Td> </Tr>

Who had supreme power in the athenian government