During the middle ages, bibles and other christian literacy were generally

The Middle Ages begin in the fifth century AD, counting from the year of the fall of Rome. At that time the western half of the ancient Roman Empire, dominated by the barbarians, spoke Latin and had an excellent version of the Bible: the Vulgate of San Jerónimo; the eastern half of the empire, which survived until the Turks conquered Constantinople in the fifteenth century, spoke Greek and could read in that language both in the New Testament and the Old (the latter in several versions, such as the LXX); so that in the Middle Ages the people had a vast knowledge of the Scriptures.

The Bible was translated into the vernacular languages ​​many centuries before the pseudo-reformation of Luther, Calvin and company, for: The Catholic saints Cyril and Methodius translated the Bible into ancient Bulgarian in the ninth century, in the middle of the Middle Ages.

i think it is the byzantine empire