The Codex Sinaiticus is a 4th century, Greek manuscript of the Old Testament and New Testament. The oldest complete Bibles are the Codex Vaticanus and the Codex Sinaiticus. These two texts, though they comprise the oldest complete New Testaments, were written hundreds of years after the oldest extant manuscripts. Accordingly, virtually all modern translations of the Bible use the older manuscripts. Only the English Revised Version and American Standard Version, each written around 1900, used the Codex Vaticanus and Codex Sinaiticus.