 Complete the following phrase:  The period of the 5th century BC in classical Greece is generally considered as beginning in 500 BC and ending in 404 BC, though this is debated. This century is essentially studied from the Athenian viewpoint, since Athens has left more narratives, plays and other written works than the other Greek states. If one looks at Athens, our principal source, one might consider that this century begins in 510 BC, with the fall of the Athenian tyrant and Cleistheness reforms. If one looks at the whole Greek world, however, we might place its beginning at the Ionian Revolt in 500 BC, that provoked the first Persian invasion of 492 BC. The Persians called Medes were finally defeated in 490 BC. A 