Emperor Lucius (also Lucius Tiberius) battled King Arthur early in his reign. Lucius demands that Arthur pay tribute to Rome. When Arthur refused, Lucius begins to invade Arthur's allies in Brittany, but Arthur crosses the channel and defeats him.

No Roman emperor of that name ever existed in real life. Geoffrey of Monmouth called Lucius a 'procurator' who serves under Emperor Leo.

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