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let's say somehow Tsar Simeon I of the First Bulgarian Emperor manages to capture Constantinople in 925 and crown himself the Byzantine Emperor (probably with Constantine VII as co-emperor).... what would happen next?
would Bulgaria be eventually integrated into Byzantium (maybe after Simeon's weaker sons get the throne)?
would Byzantium decay from there, with Bulgaria seizing much of the European empire and Greek warlords breaking free in Anatolia?