Well, according to Wikipedia, the Galtians were still speaking Gallic in the time of St. Jerome. But its an unsourced statement from Wikipedia. Plus, I've read some Jerome and don't remember him talking about Galatia (my knowledge of Jerome is by no means exhaustive, though). So I take it with a graim of salt.
Anyway, even if they did maintain the language, that's very different from retaining the traditional fighting style. Already by EB's time frame nude fighting was on its way out. Languages, on the other hand, have a tendency of sticking around a long time.
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