The document provides background information on Byzantine art during the rule of Emperor Justinian from 527-565 CE. It discusses how Justinian sought to restore the Roman Empire to its former glory through military campaigns and sponsored monuments. A key project was the reconstruction of the Hagia Sophia in Constantinople, which featured a central dome structure and was decorated with rich mosaics and marbles. Another important church from this period was the Church of San Vitale in Ravenna, which had a central plan and was decorated with lavish biblical mosaics depicting Justinian and religious figures in a stylized, non-naturalistic fashion.