At least, according to the calculations of Eratosthenes, it ended on this date.
You know the story: Paris and Helen, Menelaus and Agamemnon, Hector and Achilles, Ulysses and a huge wooden horse. Ten years of war before the walls of Troy, ended finally by gambling on a deception.
In the end, the Greeks swept in, destroying the city and leaving very few survivors. Legend holds that some of them went to Carthage, and then to found Rome; another group of survivors founded London. Being descended from a Trojan was like the first millennium equivalent of being descended from convicts in Australia is today – it was thought cool.