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The long Roman conquest of Britain begins. Aulus Plautius lands with four legions and an equal number of auxiliaries and defeats the Britons, led by Caratacus and Togodumnus, in battles on the rivers Medway and Thames. He halts at the Thames and sends for the emperor Claudius, who leads the march on Camulodunum. Meanwhile, the future emperor Vespasian begins to subdue the south-west. The Romans found the cities of London, then known as Londinium, and Peterborough, and begin to construct a road that later becomes Ermine Street.