But...Is it not more like Englishmen celebrating Alfred the Great? You know, the Anglo-Saxon leader. A Germanic peoples (Alfred's army was also made up of Britons)
Alfred would not be the correct analogy to Gaul/Rome. The Gauls were "Celtic" like Arthur's Britons. They were both facing invasions.
Alfred's French analogy would be Charles the Simple, who had to fight off the Norse invaders and made a treaty to give them Normandy. Though, it has to be said, Charles the Simple had a much better time of it.