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 Old Testament canon received by all, must have the sanction of Jewish antiquity, and must moreover be adapted not only to edification, but also to the 'confirmation of the doctrine of the Church', to borrow Jerome's phrase." Following Martin Luther, Protestants regard the deuterocanonical books as apocryphal (non-canonical). According to J. N. D. Kelly, "It should be observed that the Old Testament thus admitted as authoritative in the Church… always included, though with varying degrees of recognition, the so-called Apocrypha or deuterocanonical books." The Early Christian Church used the Greek texts since Greek was a lingua franca of the Roman Empire at the