The Romans founded Londinium (the Roman name for London) in the year 43 AD following an invasion led by the Roman Emperor Claudius.
A century later they built a defensive Roman wall around the city in what was one of the largest construction projects carried out in Roman Britain. The wall survived for another 1,600 years, and parts of it can still be seen today next to the Museum of London. The museum also has an extensive collection of artefacts from Roman London.
The ruins of a massive Roman pier base for a bridge were found in 1981, close to the modern London Bridge which confirmed that Londinium was an important commercial and trading centre.
Remains of London's amphitheatre were recently discovered in the north of the city, and you can visit them at the Guildhall Art Gallery. The dark circle of bricks in the courtyard outside shows where the Roman amphitheatre in London once stood.