Byzantine exile to Carthage and nominal and temporary alliance with Arabs during mid seventh century while Eastern and Western Roman "Empires" gradually reunite. Meanwhile, the Arabs push further and further into Africa and slowly conquer the Balkans.
Eventual war with Rome moved Roman seat of power back to the city of Rome and Muslims expand further into Spain and Eastern Europe. Possible Roman push north into France and Germany to secure territory and resources for reconquista against Islam?
How am I doing so far?
Sounds like a story.
I doubt there would be any alliance with the arabs. The romans have to defend Africa in the 7th century, no matter what. If they loose, they will move to Ravenna and defend Sicily, Sardinia and Southern Italy against the Arabs. This attack happened in OTL, too.
I doubt this rather small roman empire can reconquer France and Germany. But an alliance with the Franks and even the Visigoths sounds feasible. Italy alone is just not strong enough to rebuild the former WRE from there. Perhaps a unified Italy during mid-age is an option. A roman emperor in Italy might also lead to an interesting conflict with the pope.
If you like the see the Roman Empire survive, the romans better never loose Anatolia, Egypt and Africa!
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