The history of the Jews in the Byzantine Empire has been well-recorded and preserved.
After the decline of the Greek-speaking Hellenistic Judaism in ancient times, the use of the Greek language and the integration of the Greek culture in the Judaism continued to be an integral part of the life in Jewish communities in the Byzantine Empire. The juridical standing of the Jews of the Byzantine Empire was unique during the entire history of the Empire; they did not belong to the Christian Eastern Orthodox faith, which was the state religion, see State church of the Roman Empire, nor were they—in most circumstances—grouped together with heretics and pagans. They were placed in a legal position somewhere between the two worlds. The place along the spectrum of social freedom in which Byzantine Jews found themselves varied somewhat—though far from drastically—with time, and depended largely on three factors: the theological desire of the state to maintain the Jews as a living testament to the victory of Christianity, the desire of the state to strengthen its control, and the ability of centralized rule from Constantinople to enforce its legislation.
In 212, Caracalla bestowed citizenship on all its residents, including the Jews. This granted Jews legal equality to all other citizens, and formed the foundation of their legal status in Byzantium following the founding of Constantinople in 330. Indeed, Jews enjoyed the right to practice their faith under the rule of the Byzantines, as long as they paid the Fiscus Judaicus. For example, circumcision, which was considered mutilation and therefore punishable by death if performed on a non-Jewish child, and by exile if performed on a non-Jewish adult, was legally permitted within Jewish religious practices. Byzantine law recognized synagogues as places of worship, which could not be arbitrarily molested, Jewish courts had the force of law in civil cases, and Jews could not be forced to violate Shabbat and their festivals.