In 55 BD Julius Caesar (ca. 100-44 BC) invaded Britain, but the actual conquest of the country took place in the years 43-47 AD under the Reign of Emperor Claudius (10 BC-AD 54). The Romans introduced their civilization and language. The most important characteristic of Roman Britain was the towns, connected by roads, many of which still exist today.
In AD 409 Emperor Honorius (384-423) withdrew his soldiers from Britain to defend Rome against a Barbarian attack. the Romanised Celts were left to fight alone against some Germanic tribes who invaded the island destroying the Roman British towns.
They were the Angles, the Saxons and the Jutes and gave the larger part of Britain its new name: England, that is, "the land of the Angles".