Why was Justinian characterized as the new Caesar?

Justinian was characterized as the new Caesar due to his ambitious efforts to restore the Roman Empire's former glory, both in terms of territorial expansion and legal reform. He sought to reconquer lost territories in the West, leading military campaigns that reclaimed parts of North Africa, Italy, and Spain. Additionally, his codification of Roman law in the "Corpus Juris Civilis" established a legal framework that influenced many future legal systems, echoing Caesar's legacy of governance and law. This combination of military endeavors and legal reforms positioned Justinian as a successor to the ideals of the ancient Roman emperors.