One non-Roman feature in the Byzantine empire was?

One non-Roman feature of the Byzantine Empire was its use of Greek as the primary language, which reflected the Hellenistic culture that persisted after the fall of the Western Roman Empire. Additionally, the Byzantine Empire was characterized by its unique blending of Christian theology with classical philosophy, influencing its art, architecture, and legal systems, exemplified by the construction of the Hagia Sophia and the codification of Roman law through the Justinian Code. This distinct cultural identity set Byzantium apart from its Roman predecessors.