Emperor Justinian is identified as one of the greatest Caesars to ever rule in Europe during his reign from 527 to 565, during which he managed to revive the Roman authority throughout its growing empire of Byzantium. As emperor of the Byzantine Empire in the 6th and 7th centuries he conquered many parts of Europe, once again restoring control of Roman authority, if only for a while. This essay will highlight the extent to which Justinian succeeded Roman authority. Although many depictions can be debated, a closer examination can demonstrate that through enormous military successes, architectural activities that changed the value of the Empire and strengthened Constantinople as the center of the Christian world, and the legal work of the "Code of Justinian" helped Justinian revive Roman authority. In the 7th century, the collapse of the Byzantine Empire occurred, which was defeated and conquered by the Turkish-Ottoman Empire from the east of Constantinople. This essay will access the reasons for the decline of such a powerful empire, hit by the "Justinian Plague" and ultimately deteriorated after Justinian's death. This saw the end of every last element of any Roman authority in Europe. Military Triumphs During Justinian's reign he was able to conquer and conquer many parts of Europe by expanding his empire of Byzantium, which was a great start in reviving Roman authority. He took back a huge amount of territory that once belonged to the Roman Empire before the 4th and 5th century barbarian invasions of Western Europe, including North Africa and Italy. Justinian's extensive war against the Persians east of Constantinople was a problem for Justinian, but after several battles a peace was agreed on fairly equal terms. Justinian then de...... middle of paper ......illusion Justinian's rule was a successful vision in which he revived Roman authority through the Byzantine Empire through several campaigns to "take back" what it was once Roman territory in the 5th century. In this way, in addition to the "anomalous" loss caused by the plague and the damage to the economic and military outlook, the Byzantium Empire was no longer economically able to defend its states and finally fell when Constantinople was conquered by the Ottoman Turks . The extent to which Justinian revived Roman authority during his rule was astronomical and presented him as one of the greatest Caesars of the medieval period. But through the events that took place to gain Roman authority, the losses in financial power and population diminished and Byzantium rapidly declined after Justinian's death and Roman authority was lost forever..