Describe Where the Byzantine empire fell within Roman territory

The Byzantine Empire was constituted by one part of the division of the Roman Empire, in the year 395, in two parts: Roman Empire of the West, with capital in Milan and Roman Empire of the East, with capital in Constantinople. The Byzantine Empire or Roman Empire of the East conserved for a long time the Roman traditions even the Christianity. In the hands of his main emperor, Justinian remained urbanized while in Western Europe the cities disappeared. Hope this helped.