I'm currently reading a book titled "The Formation of Christendom" by Judith Herrin and in it she describes how in the 660s (East) Roman Emperor Constans II, father of Constantine IV, chose Syracuse as his imperial residence and even considered making it the formal capital of the Empire (pp. 264). This move occurred because of his expeditions to the Italian peninsula, and it was only limited in its permanence due to his family remaining in Constantinople in order to not fully abandon the main Byzantine power center in the east. But what if Constans II brings his family to Syracuse, thus turning Sicily into the main point of focus for the Byzantine Empire? I was actually inspired to make this thread because she then suggests that if the capital had been moved to Syracuse, that Constantinople might've fallen to Muslim invaders about 800 years earlier than it did IOTL (pp. 274), and it's relatively rare to see proposed counterfactuals in published historical non-fiction. So what do y'all think? What would the consequences of such a move be? Would it be beneficial for the Empire or would it spell an early doom for Christian rule in Asia Minor and possibly even Balkans like Herrin suggests? Addendum: I wanted to add an illustrative map for this but couldn't find anything better than this one for presumably 650 AD, but it should give some idea on what the Byzantine looked like around that time.