The Roman Empire was a wealthy empire. Rome was one of the largest cities in the world. Augustus was the first emperor of Rome. Augustus had meaningful authority in Rome. Constantine led the civil war, and became the ruler of the capital. He renamed the capital Constantinople. When Constantinople came into existence, the population grew roughly around 50 to 90 million. Constantine adopted the religion Christianity and it later became the official state religion. During Constantine ruling, the empire was divided along an east-west axis. The Roman expansion was mostly accomplished under the Republic. When Augustus died, his achievements were featured as the geographical cataloguing of peoples and places within the empire. Many Romans spoke and