Answer:
From the year 330 and by order of the Emperor Constantine, the city of Byzantium became the capital of the Roman Empire. The main motivation behind this decision was strategic: the city of Byzantium, later renamed Constantinople, was located in what we know today as Istanbul, Turkey, on the intercontinental passage between Europe and Asia. Thus, this city was right in the middle of the main route that connected the Roman Empire with the cities of the Middle East, India and China, being fundamental for the control of said trade and the exercise of a notable political and economic influence in the region.