Today, we examine the reign of Constantine, Theodosius I, and the other Roman Emperors until the fall of Rome. We also follow the progress of the Byzantine Empire through Zeno, Justinian, and Heraclius, among others. Through all of this, we continue our look at the development of the Catholic Church. We briefly look at the Huns and Arabs, as they relate to the history of Rome and Constantinople. Finally, we return to Rome to view the clash over iconoclasm in which the pope challenges the emperor.