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,
Development of the New Testament canon and 26-book NT (excludes Revelation). In his Easter letter of 367, Athanasius, Bishop of Alexandria, gave a list of exactly the same books as what would become the 27-book NT canon, and he used the word "canonized" (kanonizomena) in regard to them. The Cheltenham List, c. 365–90, is a Latin list discovered by the German classical scholar Theodor Mommsen (published 1886) in a 10th-century manuscript (chiefly patristic) belonging to the library of Thomas Phillips at Cheltenham, England. The list probably originated in North Africa soon after the middle of the 4th century. It has a 24-book Old Testament and 24-book