It was 55 B.C., Julius Caesar and his army stepped foot on, what is now known as, England.
The first invasion, in late summer, was unsuccessful. Julius Caesar crossed the Channel with a force of around 10,000 soldiers. They landed on the beach at Deal and were met by a force of Britons. The Romans eventually took the beach and waited for cavalry back up to arrive from France. However, a storm prevented the back up force from reaching Britain and Caesar had to withdraw, gaining the Romans little else besides a beachhead on the coast of Kent. The second invasion achieved more: the Romans installed a king,Mandubracius. You can't find much back from the Roman occupation of England besides the Hadrian's Wall and a couple of Roman baths.
Hadrian's Wall was a wall 80 miles long to separate the Romans from the barbarians