Final answer:
Constantine was the first ruler of Rome and a significant figure in the transition from the Roman Republic to the Roman Empire.
Step-by-step explanation:
Constantine was the first ruler of Rome. He was also known as Constantine the Great and ruled from 306 to 337 AD. He played a significant role in the history of the Roman Empire as he became the first Roman emperor to convert to Christianity and made it the official religion of the Empire. Constantine's reign marked a pivotal moment in the transition from the Roman Republic to the Roman Empire.
Learn more about Constantine's rule and impact on the Roman Empire