Interesting use of the word "allegedly". The last remaining Roman troops in Britain are believed to have crossed the Channel in AD 407 with their chosen leader, Flavius Claudius Constantinus (known in English as Constantine III), to help repel an invasion of Gaul by several tribes of barbarians, including the Vandals. The Romano–Britons, already suffering invasion by the Angles, Saxons and Jutes, and finding themselves with no military defenders, appealed to the Western Emperor Honorius for help. But most of Honorius's troops had been recalled to Rome to defend the city from the Visigoths, and the appeal was refused. The Romano–Britons subsequently expelled the remaining Roman magistrates. Britain fell into the Dark Ages, and there was no contemporary source around to record the actual year in which the last Romans left Britain. But there is no record of any Roman presence in Britain after AD 410.
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