The document discusses the rise of Christianity and Byzantine art and architecture during the Byzantine Era. Roman basilica floor plans were adapted for early Christian churches. Justinian reconquered parts of the former Western Roman Empire and established Ravenna as the new capital, where many new churches were built. His reign marked the Golden Age of Byzantine culture, exemplified by architectural masterpieces like the Hagia Sophia in Constantinople, which featured innovative use of pendentives to support its grand dome. Byzantine art also developed a distinctive style using bright glass mosaics to depict biblical stories and figures.