Definition of the glossary term Byzantine Period
The Byzantine Period, also known as the Eastern Roman Empire, refers to the period of Roman history when the capital city was located at Constantinople, which was founded by Emperor Constantine in A.D. 330. During this time, Greek was the primarily spoken language, and the old pagan (polytheistic) Roman religions were outlawed and replaced in favor of Christianity.
The end of the Byzantine Period came when the Ottomans conquered Constantinople in A.D. 1453.