Britannia
The early Romans called Britain "Britannia" after the natives who lived there at the time, the Bretons. Three groups of people had occupied Britain by the time the Romans first arrived: Neolithic Man, the "Beaker People", and the Celts.
Julius Caesar led an expedition to Britain in 55 BC. Caesar "wished to put an end to the use of Britannia as a sanctuary by the leaders of Gaul....rebelling against their Roman overlords." After two perfunctory conquest attempts of the island, Caesar never returned, and Romans would not fully subjugate Britain until the emperor Claudius' reign.

(Image Details: Roman Army of Julius Caesar landing in Britain)
Julius Caesar led an expedition to Britain in 55 BC. Caesar "wished to put an end to the use of Britannia as a sanctuary by the leaders of Gaul....rebelling against their Roman overlords." After two perfunctory conquest attempts of the island, Caesar never returned, and Romans would not fully subjugate Britain until the emperor Claudius' reign.
(Image Details: Roman Army of Julius Caesar landing in Britain)