Constantius was elevated to Caesar with one primary mission - retake Britannia for the Roman empire. In the later half of the fourth century the province and parts of western Gaul had retained a stubborn sort of independence, flying in the face of a unified Rome. If the tetrarchy were to prove they were a stable system, this had to come to an end.
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Episode CCLII (252)
Part IV of Diocletian
Guest: Professor Caillan Davenport (Centre for Classical Studies, Australian National University)