Final answer:
The Byzantine Empire belonged to the Eastern Orthodox Church.
Step-by-step explanation:
The religion of the Byzantine Empire was Eastern Orthodox Church. The Byzantine Empire was a continuation of the Roman Empire and its religion was based on the teachings and traditions of the early Christian Church. The Byzantine Emperor was considered the head of the church and held significant power in religious matters. The Empire played a major role in the spread of Christianity and the development of religious art and architecture.
Learn more about Religion of the Byzantine Empire