Building and maintaining an empire usually required the vicious slaughter of large populations and the brutal oppression of every-one who was left. The standard imperial toolkit included wars, enslavement, deportation and genocide. When the Romans invaded Scotland in AD 83, they were met by fierce resistance from local Caledonian tribes, and reacted by laying waste to the country. In reply to Roman peace offers, the chieftain Calgacus called the Romans ‘the ruffians of the world’, and said that ‘to plunder, slaughter and robbery they give the lying name of empire; they make a desert and call
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