Roman Britain's Pirate King

In the mid-3rd century AD Roman Britain's regional fleet, the Classis Britannica, disappeared. It was never to return. Soon the North Sea and English Channel were over-run by Germanic pirates preying upon the east and south coast of Britain, and the continental coast up to the Rhine Delta. The western augustus (senior emperor) Maximian turned to a seasoned naval leader called Marcus Aurelius Mausaeus Valerius Carausius to restore order. He was so successful that Maximian accused him of pocketing the plunder he'd recaptured, ordering his execution. The canny Carausius moved first and in 286 usurped imperial authority, creating a North Sea empire in northern Gaul and Britain which lasted until 296. Dubbed the pirate king, he initially thrived, seeing off early attempts by Maximian to defeat him. However, in the early 290s Maximian appointed his new caesar (junior emperor), Constantius Chlorus (the father of Constantine the Great), to defeat Carausius. A seasoned commander, Constantius Chlorus soon brought northern Gaul back into the imperial fold, leaving Carausius controlling only Britain. Carausius was then assassinated and replaced by Allectus, his treasurer. Allectus was in turn defeated by Constantius Chlorus in AD 296 in the fourth Roman invasion of Britain, the caesar arriving just in time to prevent London being sacked by Allectus' Frankish mercenaries. Once more Britain was part of the Roman Empire.

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