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In the event that the Sassanids would have defeated the ERE in the early 7th century, could they have established a sort of 'Western Sassanid Empire' with see in Constantinople (once the city would have been cleared of Byzantines) or maybe they would have opted for the creation of Greek client states in the Aegean?
Are there historical documents about the intentions of the Sassanids in the case they would succeed conquering the ERE?