Final answer:
The Code of Justinian was a turning point in the regulation of the Byzantine Empire as it established a legal code, bringing consistency and order to the Byzantine legal system.
Step-by-step explanation:
The Code of Justinian was a turning point in the regulation of the Byzantine Empire because it established a legal code. Justinian sought to unify the empire by imposing Roman law on all subject peoples. He had legal experts compile and edit the Corpus Juris Civilis, which became the foundational basis for many legal systems in Europe. This codification of laws brought consistency and order to the Byzantine legal system, promoting stability and unity throughout the empire.