Fourth-century Greek manuscript of the Bible. So named because it was discovered on Mt. Sinai in the mid-1850s, Sinaiticus is probably one of fifty copies of the Scriptures commissioned by Emperor Constantine (done between 330 and 350). Sinaiticus contains the Septuagint version (Greek copy of originally Hebrew texts) of the Old Testament, the apocryphal books, the New Testament, and two non-canonical books from the New Testament era: Epistle of Barnabas and Shepherd of Hermas. See also apocrypha; Barnabas, Epistle of; Bible; canon; Codex Vaticanus; Constantine the Great; Greek; Hebrew; Shepherd of Hermas.