Юстиниан I, also known as Justinian the Great, was a Byzantine Emperor who ruled from 527 to 565 AD. He is best known for his ambitious efforts to restore the Roman Empire's former glory, which included military campaigns to reclaim lost territories in the West. His reign marked a significant period of cultural and legal development. One of Юстиниан's most notable achievements was the codification of Roman law, resulting in the Corpus Juris Civilis, or "Body of Civil Law." This legal framework has had a lasting influence on modern legal systems. Additionally, he commissioned the construction of the magnificent Hagia Sophia, a symbol of Byzantine architecture and Christian faith.