The trinovantes, whose Kings in the pre-Roman period included Addedomus, Tasciovanus and Dumnovellaunus, formed an alliance with Julius Caesar during his invasions of 55-54BC. Caesar protected them against their powerful and aggressive neighbours the Catuvellauni. Fifty years later Roman policy had changed : political entanglements outside the empire were avoided, and Cunobelinus was able to subjugate not only the Trinovantes but also other friends of Rome including the Atrebates.
