Who created a system of 400 laws for the Byzantine Empire?

The system of 400 laws for the Byzantine Empire was created by Emperor Justinian I. This legal code, known as the "Corpus Juris Civilis" or "Body of Civil Law," was compiled in the 6th century and aimed to consolidate and organize existing Roman laws and legal principles. It served as a foundation for legal systems in many European countries and significantly influenced the development of modern law.