London is the biggest city in Western Europe. People have lived here for more than 5,000 years, but instead of a city, there used to be forests and marshes. Legend says that the city was founded not by the Romans of the 1st century AD, but by Brutus the Trojan, around 1070 BC, about 1,000 years before the Roman invasion. Brutus was the great-grandson of Aeneas, a Trojan prince and one of the few survivors after the Greeks destroyed Troy.