Mario, Rome used Greek structuring, the city states in those regions allowed moderated rule backed by their legions. I agree Rome didn't go as far into Asia, but Rome went deeper colonising further into Europe. Later they ruled from Turkey falling to the Turks, before returning back to Rome, when their own capitol Rome was finally sacked, because of prior revolt and inept leadership.
Owen Glyndwr, Attila like Caligula and many Roman others, sounds Roman, definitely not quite a Hun or that Gothic, sarcasm Obelix, and Asterix. Let us now create our own mythology; How a lost legion outlawed by christainity holds onto the old gods of war, Conan the Hun, adapting Alexander's history uniting the tribal clans into the Huns, and sacks Rome. Only later becoming earsed by christanity once settling upon their victory there. Although the same horde of tribal horse clans retreat away from conflict, holding onto their own older ways, later form the Mongols.
We can summarised with Rome changing capitol due to it's final sacking, when the previous christain revolt changed leadership and unstructured their empire, and the burial place of Attila not being found. That any reasoning here is as good a myth as any other concerning those darker ages, combined with the inability to keep all valid records, outside of everything christian.