Excerpts from Books and Wikipedia
Julius Caesar crossed the Strait of Dover with 80 transport vessels, 2 Roman legions, and supporting warships. The landing party sailed back to Gaul after fierce resistance from the Britons. It was not until 43 AD that 11 British tribes submitted to the rule of Emperor Claudius. Rome ruled Britain for almost 400 years. [Furtado: 1001 Days] He led two expeditions in Britain (55 and 54 BC); [Grammar Ancient World, p. 203]