The Institutes of Justinian

This is the code of laws implemented by Justinian the Great, the most famous Byzantine emperor of all. The internal stabilization of the Byzantine state was completed, and Justinian then embarked on a wide range of external re-conquests. Justinian's prime directive was to restore the Roman Empire to its former glory in the west. He sought to strengthen the immutable law that Byzantium, the successor of Rome, maintained not only in the east but also the west, and by doing so, he hoped to revive the unity of the Roman world. In addition to attempting to conquer Italy and restore all the old dominions of the Roman Empire, Justinian also had to quell inner unrest by fighting barbarian usurpers, securing the borders, re-establishing religious orthodoxy, reorganizing the law, and reviving prosperity.