The first British Empire

In the third century AD, Britain was the epicentre of a massive rebellion that shook the Roman empire to its core. Kevin Butcher tells the story of Britannia's usurper emperors...

Gold medallion of Constantius I, from the mint of Trier. It depicts Constantius celebrating his victory over Alectus in AD 296. Constantius is shown on a horse at the gates of London, welcomed by Britannia. (Photo by CM Dixon/Print Collector/Getty Images)

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