After the Romans conquered Britain, it became part of the Roman Empire. An area of the Empire like this was called a province. A governor ruled it for the Emperor. In their Brythonic language, the British called their island 'Prydein,' but the Romans spoke Latin and called it 'Britannia'. At first, Britannia was one province. Then it was split into 2 provinces, and then 4. There were capitals cities at Londinium (London), Corinium (Cirencester), Eboracum (York) and Lindum (Lincoln). The governors were then called consuls or presidents. The island became a big province called a 'diocese'. It was ruled for the Emperor by more important governor called a vicarius. The Roman army helped the governor rule the island. The Romans brought lots of new ideas to Britain. This is called 'Romanization'. new ways of doing things new ways of living new gods to worship new ways to dress new styles of building new and exciting technology.  However, the British kept many of their old Celtic ways too. People came to trade with and live in Britain from all over the Empire. The Romans set up towns with local councils. Each ruled over the surrounding area called a 'civitas' (like a county). They collected farm produce and money in taxes for the Emperor. The Romans ruled Britain for nearly 400 years. Eventually, troubles back in Rome forced the army to go home to try and sort them out. Britain was told it had to look after itself.