Final answer:
Constantine moved the capital of the Roman Empire to Constantinople for strategic reasons such as its proximity to troubled frontiers, to signify a new era for the empire, and because of its excellent harbor, not because of a divine vision.
Step-by-step explanation:
Emperor Constantine moved the capital of the Roman Empire from Rome to Constantinople for several strategic reasons, but not because he received a vision from God advising him to build a new capital. Some of the true reasons for relocating the capital include Constantinople's proximity to the Danube frontier, which was a troubled area and needed the emperor's attention. The establishment of the new capital also signified a new era for the Roman Empire, emphasizing the importance of Christianity within the empire. Moreover, Constantinople's location was strategically chosen for its excellent harbor and control over trade routes connecting Europe and Asia.