Protocanonical books Protocanonical books The protocanonical books are those books of the Old Testament that are also included in the Hebrew Bible (the Tanakh) and that came to be considered canonical during the formational period of Christianity. The term "protocanonical" is often used to contrast these books to the deuterocanonical books or apocrypha, which "were sometimes doubted" by some in the early church, and are considered non-canonical by most Protestants. There are typically 39 protocanonical books in most Christian bibles, which correspond to the 24 books in the Jewish Tanakh. The list of protocanonical books is Genesis, Exodus, Leviticus, Numbers, Deuteronomy, Joshua,
Development of the Old Testament canon "Apocrypha" ("hidden"). To counter Luther's "heresy", the fourth session of the Catholic Council of Trent in 1546 confirmed that the deuterocanonical books were equally authoritative as the protocanonical in the Canon of Trent in the year Luther died. Following Jerome's "Veritas Hebraica" (truth of the Hebrew) principle, the Protestant Old Testament consists of the same books as the Hebrew Bible, but the order and division of the books are different. Protestants number the Old Testament books at 39, while the Hebrew Bible numbers the same books as 24. The Hebrew Bible counts Samuel, Kings, and Chronicles as one book each,