In the first question, the correct answer is the Tetrarchy. Diocletian was Roman emperor from 284 to 305 CE. During his reign, he instituted economic and tax reforms to stabilize the Roman Empire, which marked the end to the so called Crisis of the Third Century. Once Emperor, he restructured the Roman government by establishing a Tetrarchy, a system of government in which power is divided between four individuals. Diocletian appointed Maximian as co-emperor to rule the Western side of the Empire and he (Diocletian) would rule the Eastern side. He also appointed two junior co-emperors, Galerius and Constantius, who ruled under Diocletian’s and Maximian’s command respectively. Under this tetrarchy, four people shared rule over the Roman Empire, each of them would rule over a quarter of the Empire.
In the second question, the correct answer is Paul of Tarsus. Paul of Tarsus, commonly known as Paul the Apostle or Saint Paul, is one of the most important figures in Christian history because he dedicated his life to spreading the Christian message during the first century CE. He evangelized in several of the most important urban centers of the Roman Empire where he established Christian communities - Antioch, Corinth, Rome-, he founded several churches, and today he is attributed to have written seven of the twenty-seven books in the New Testament.
