original: The city is what later evolved to be the center of the Byzantine Empire (the Greek-speaking Roman Empire of late Antiquity and the Middle Ages) under the name of Constantinople.
simplifications: The city later became Constantinople, the center of the Byzantine Empire. It became the city of Constantinople and center of the Byzantine Empire. The city evolved to be Byzantine Empire's central, as Constantinople. The city later became the center of the Byzantine Empire (the Greek-speaking Roman Empire of late Antiquity and the Middle Ages) named Constantinople. The city later became the center of the Byzantine Empire. That was the Greek-speaking Roman Empire of late Antiquity and the Middle Ages. It was Constantinople. The city later became Constantinople, the center of the Byzantine Empire. The city later evolved to be the center of the Byzantine Empire under the name of Constantinople. The city is what later came to be the center of the Byzantine Empire under the name of Constantinople. The region became the center of the Byzantine Empire (the Greek-speaking Roman Empire of late Antiquity and the Middle Ages) under the name of Constantinople. The city grew to be the center of the Byzantine Empire under the name Constantinople.