At the heart of this study of Carausius (286-93) lies an illustrated catalogue of his significant bronze coinage, incorporating recent, important hoard discoveries. The production and supply of this coinage is then investigated in order to throw light on the usurper's control of the First British Empire'. Alongside the evidence of the coins themselves, Hugh Williams examines archaeological evidence from late 3rd-century Britain, highlighting the significance of sites where the coins were minted or discovered. Williams concludes that the presence of Carausius' coinage in certain military and civilian sites indicates heightened activity and migrations of civilian populations. These were clearly dangerous times.