Which Roman Emperor Temporarily Reunited The Roman Empire after it Was Split In Half?

The Roman Emperor who temporarily reunited the Roman Empire after it was split in half was Justinian I. He ruled from 527 to 565 AD and is known for his ambitious military campaigns aimed at reclaiming lost territories in the West, including parts of Italy and North Africa. His reign also saw significant legal and architectural achievements, including the codification of Roman law known as the "Corpus Juris Civilis" and the construction of the Hagia Sophia. However, the reunification was short-lived, as the empire would eventually face further fragmentation.