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 named as Canonical books the books of the Hebrew Bible and the deuterocanonical books named as "Ecclesiastical" books. Pope Innocent I (405 AD) in a letter sent to the bishop of Toulouse cited as Canonical books the books of the Hebrew Bible plus the deuterocanonical books as a part of the Old Testament Canon. The Decretum Gelasianum which is a work written by an anonymous scholar between 519 and 553 contains a list of books of Scripture presented as having been made Canonical by the Council of Rome (382 AD). This list mentions the Hebrew Bible plus the deuterocanonical books