Final answer:
The creation of the Byzantine Empire was influenced by Emperor Constantine's decision to establish a new capital and concentrate power in the east. The Byzantines also utilized aggressive diplomacy to maintain their empire.
Step-by-step explanation:
The creation of the Byzantine Empire was led by several factors. Firstly, the decision by Emperor Constantine to establish a new capital in Byzantium, which he later renamed Constantinople, played a crucial role. This shift of power to the east and the concentration of wealth and influence in the eastern half of the Roman Empire set the stage for the Byzantine Empire's formation. Additionally, the aggressive use of diplomacy by the Byzantines, such as the establishment of the Bureau of Barbarians and the manipulation of foreign governments, helped to maintain their longevity.