На каком языке писали книги в Средневековье?
The books of the Bible were not originally written in Latin. The Old Testament was written in Hebrew (with some parts in Greek and Aramaic) and the New Testament in Greek. The Septuagint, still used in the Greek Orthodox church, is a Jewish translation of the Old Testament into Koine Greek completed in the 1st century BC in Alexandria for Jews who spoke Greek as their primary language.
Latin