Code of Justinian, Latin Codex Justinianus, formally Corpus Juris Civilis (“Body of Civil Law”), collections of laws and legal interpretations developed under the sponsorship of the Byzantine emperor Justinian I from 529 to 565 ce. Strictly speaking, the works did not constitute a new legal code.
Roman law was indeed a great institution. They developed many of the ideas of justice which we today take for granted. Already in 451 BC they created basic laws which governed them all, laying down what one could and could not do. They wrote them down on twelve plates made of bronze, which became known as the Twelve Tables. These were the first examples of written law. Much later a great Roman emperor of Constantinople, Justinian, refined many of the laws of the day and collected them all into one work. This is known as the Justinian Code and it was completed in AD 529. These laws form the basis of all today's justice systems in the western world.