Political map of Europe & the Mediterranean 16 August 43 AD (Claudius’ invasion of Britain): By c.40 AD the expansion of the Catuvellauni in Britain had brought an end to the Roman client kingdoms set up by Julius Caesar over a century earlier (Roman client kingdoms in Britain). After succeeding Caligula (41 AD) and restoring stability to the Empire, Claudius led a retaliatory invasion of Britain in 43 (Roman conquest of Britain). The Romans quickly defeated the Catuvellauni, capturing their capital of Camulodunon (Colchester) a few weeks after landing.