The Vulgate is a Latin version of the Holy Bible, and largely the result of the labors of St Jerome (Eusebius Sophronius Hieronymus), who was commissioned by Pope Damasus I in 382 A.D. to make a revision of the old Latin translations. By the 13th century this revision had come to be called the versio vulgata, that is, the "commonly used translation", and ultimately it became the definitive and officially promulgated Latin version of the Holy Bible in the Catholic Church.
Saint Jerome had been commissioned by Pope Damasus to revise the Old Latin text of the four Gospels from the best Greek texts, and by the time of Damasus' death in 384 A.D. he had thoroughly completed this task, together with a more cursory revision from the Greek Septuagint of the Old Latin text of the Psalms.
After the death of the Pope, St. Jerome who had been the Pope's secretary, settled in Bethlehem, where he produced a new version of the Psalms, translated from the Hexaplar revision of the Septuagint. But from 390 to 405 A.D., St. Jerome translated anew all 39 books in the Hebrew Bible, including a further, third, version of the Psalms, which survives in a very few Vulgate manuscripts. This new translation of the Psalms was labelled by him as "iuxta Hebraeos" (i.e. "close to the Hebrews", "immediately following the Hebrews"), but it was not ultimately used in the Vulgate. The translations of the other 38 books were used, however, and so the Vulgate is usually credited to have been the first translation of the Old Testament into Latin directly from the Hebrew Tanakh, rather than the Greek Septuagint.
Saint Jerome's extensive use of exegetical material written in Greek, on the other hand, as well as his use of the Aquiline and Theodotiontic texts of the Hexapla, along with the somewhat paraphrastic style in which he translated makes it difficult to determine exactly how direct the conversion of Hebrew to Latin was.
In his prologues, Jerome described those books or portions of books in the Septuagint that were not found in the Hebrew as being non-canonical: he called them apocrypha, but they are found in all complete manuscripts and editions of the Vulgate.
Of the Old Testament texts not found in the Hebrew, St. Jerome translated Tobit and Judith anew from the Aramaic; and from the Greek, the additions to Esther from the Septuagint, and the additions to Daniel from Theodotion. The others, Baruch, Wisdom of Solomon, Ecclesiasticus, 1 Maccabees and 2 Maccabees, 3 Esdras and 4 Esdras, the Prayer of Manasses, Psalm 151, and Laodiceans retain in Vulgate manuscripts their Old Latin renderings. Their style is still markedly distinguishable from St. Jerome's. In the Vulgate text, St. Jerome's translations from the Greek of the additions to Esther and Daniel are combined with his separate translations of these books from the Hebrew.
St. Jerome's Preface to the Vulgate Version of the New Testament
Addressed to Pope Damasus, A.D. 383.
You urge me to revise the old Latin version, and, as it were, to sit in judgment on the copies of the Scriptures which are now scattered throughout the whole world; and, inasmuch as they differ from one another, you would have me decide which of them agree with the Greek original. The labour is one of love, but at the same time both perilous and presumptuous; for in judging others I must be content to be judged by all; and how can I dare to change the language of the world in its hoary old age, and carry it back to the early days of its infancy? Is there a man, learned or unlearned, who will not, when he
takes the volume into his hands, and perceives that what he reads does not suit his settled tastes, break out immediately into violent language, and call me a forger and a profane person for having the audacity to add anything to the ancient books, or to make any changes or corrections therein? Now there are two consoling reflections which enable me to bear the odium—in the first place, the command is given by you who are the supreme bishop; and secondly, even on the showing of those who revile us, readings at variance with the early copies cannot be right. For if we are to pin our faith to the Latin texts, it is for our opponents to tell us which; for there are almost as many forms of texts as there are copies. If, on the other hand, we are to glean the truth from a comparison of many, why not go back to the original Greek and correct the mistakes introduced by inaccurate translators, and the blundering alterations of confident but ignorant critics, and, further, all that has been inserted or changed by copyists more asleep than awake?
I am not discussing the Old Testament, which was turned into Greek by the Seventy elders, and has reached us by a descent of three steps. I do not ask what Aquila and Symmachus think, or why Theodotion takes a middle course between the ancients and the moderns. I am willing to let that be the true translation which had apostolic approval. I am now speaking of the New Testament. This was undoubtedly composed in Greek, with the exception of the work of Matthew the Apostle, who was the first to commit to writing the Gospel of Christ, and who published his work in Judæa in Hebrew characters. We must confess that as we have it in our language it is marked by discrepancies, and now that the stream is distributed into different channels we must go back to the fountainhead. I pass over those manuscripts which are associated with the names of Lucian and Hesychius, and the authority of which is perversely maintained by a handful of disputatious persons. It is obvious that these writers could not amend anything in the Old Testament after the labours of the Seventy; and it was useless to correct the New, for versions of Scripture which already exist in the languages of many nations show that their additions are false. I therefore promise in this short Preface the four Gospels only, which are to be taken in the following order, Matthew, Mark, Luke, John, as they have been revised by a comparison of the Greek manuscripts. Only early ones have been used. But to avoid any great divergences from the Latin which we are accustomed to read, I have used my pen with some restraint, and while I have corrected only such passages as seemed to convey a different meaning, I have allowed the rest to remain as they are.