How long did the Romans stay in Britain?

In total the Romans occupied Britain from 43 A.D. to approximatley 410/430 B.C. (300 Years). The Romans began considering the British Isles in around 55 B.C. when Julius Ceasar was on his campaigns against the Gauls. He ended up taking hostages from the lands even though his first advance was unsuccessful. Using the hostages as a form of leverage, he installed a Rome-friendly king over the lands who pacified the current ruler, Cassivellaunus.

In 43 A.D. Claudius released a true attack force with intent to conquor the lands of Britain, led by Aulus Plautius (who oversaw the building of the Trieste trade road). During the three hundred years of Roman rule they attempted to get into Scotland as well but were frequently pushed back from the borders.

In the 400's A.D. Rome pulled off the island. Scholars have argued that it was economic decline which may have driven Rome to relinquish Britain. Current evidence is beginnig to arise in the archeological realm which may refute this point so there are talks of releasing a new theory.