The historical figure associated with the consolidation of the Byzantine Empire is Justinian I. As emperor from 527 to 565 CE, Justinian sought to revive the empire's former glory, undertaking ambitious reforms in law, architecture, and administration. His creation of the Corpus Juris Civilis (Body of Civil Law) codified Roman law and influenced legal systems for centuries. Moreover, his efforts to expand the empire's territory and fortify its defenses solidified Byzantine power, while his building projects, including the Hagia Sophia, showcased the empire's cultural achievements.