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In my last thread (you can check it here) someone said that the Franks claiming to be the sucessors of the Roman empire would be like if the Hungarians had expanded into Greece and taken Constantinople and declares themselves a new roman empire

Let's say that for some reason....Maybe they convince the Pope that they can mend the great schism by taking over the byzantine empire and so they are greenlighted to do so, the Hungarians advance through Croatia and Bulgaria and seize the byzantine territory BEFORE the sack of Constantinople, and somehow they win and declare themselves to be a new Roman empire

What would happen under such byzarre circunstances?
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