Seventh-day Adventists teach that great apostasy corresponded with the rise of the power of the Roman bishop which they see as the Little Horn Power of Daniel 7 prophecy, which as predicted rose after the breakup of the Roman Empire. In 533 A.D. Justinian, the emperor of the Eastern Roman Empire, legally recognized the bishop (pope) of Rome as the head of all the Christian churches. Because of the Arian domination of some of the Roman Empire by the barbarian tribes, this authority could not be exercised by the bishop of Rome. Finally, in 538 A.D., Belisarius, one of Justinian's generals routed the Ostrogoths, the last of the barbarian kingdoms, from the city of Rome and the bishop of Rome could begin establishing his universal civil authority. So, by the military intervention of the Eastern Roman Empire, the bishop of Rome became all-powerful throughout the area of the old Roman Empire.