Lucius vs Arthur
Just another of the many, many puns and references in Harry Potter:
"Lucius fights to reclaim Gaul from his treacherous tribune Frollo at the time of King Arthur's rise to power. After Arthur conquers Gaul, word of his great deeds reaches Rome, and Lucius demands that Arthur pay him tribute and recognize him as his sovereign. When Arthur refuses, Lucius invades the land of Arthur's allies on the continent, and Arthur and his knights hurry across the English Channel to do battle with him. Arthur defeats Lucius and adds Italy to his lands."
Source.
"Lucius fights to reclaim Gaul from his treacherous tribune Frollo at the time of King Arthur's rise to power. After Arthur conquers Gaul, word of his great deeds reaches Rome, and Lucius demands that Arthur pay him tribute and recognize him as his sovereign. When Arthur refuses, Lucius invades the land of Arthur's allies on the continent, and Arthur and his knights hurry across the English Channel to do battle with him. Arthur defeats Lucius and adds Italy to his lands."
Source.