Let's consider a scenario where the Langobardic invasion of Italy in 568 is butterflied away (maybe if the Gepids somehow manage to defeat them and they are evicted from the Alpine area) and the Byzantine Empire is able to consolidate the annexation of the whole Italian peninsula after the end of the Gothic Wars.
Could the idea of returning the capital from Constantinople back to Rome be considered at some point, specially during the Byzantine-Sasanian Wars and later the Arab sieges of Constantinople, when the capital city was at risk of being captured? Or in any case should be Ravenna considered as the first option if the Emperor leaves Constantinople? Could it be done at some point by religious reasons (maybe some Emperor wants to stay in the same city where the Pope is)?
Could the idea of returning the capital from Constantinople back to Rome be considered at some point, specially during the Byzantine-Sasanian Wars and later the Arab sieges of Constantinople, when the capital city was at risk of being captured? Or in any case should be Ravenna considered as the first option if the Emperor leaves Constantinople? Could it be done at some point by religious reasons (maybe some Emperor wants to stay in the same city where the Pope is)?