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In the eventual case that Charlemagne had married Empress Irene (as it was apparently planned at some point), could it be possible for Louis the Pious to inherit both Western (Charlemagne) and Eastern (Irene) Roman Empires, assuming that Irene could have 'adopted' him as son/heir?

Is it realistic at such a late date like 814 to consider that Louis could reunite both Empires, even if temporarily? Could an event like this had helped the Christian Church to stick together or it was late for that? Which are the possibilities after this to recover any other former Roman territory like al-Andalus or Syria, for example?
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