Old Latin Codex Vercellensis
Old Latin Codex Vercellensis, preserved in the cathedral library, is a purple vellum codex  that is typically dated to the fourth-century, and is believed to be the earliest manuscript of the Old Latin Gospels. Its standard designation is "Codex a" (or 3 in the Beuron system of numeration). The order of the gospels in this Codex is Matthew, John, Luke and Mark, which is also found in some other very old "Western" manuscripts, such as Codex Bezae. In its text of Mt 3, before V. 16, it includes a statement that a light suddenly shone when Jesus was baptized. (Et cum baptizaretur, lumen ingens circumfulsit de aqua, ita ut timerent omnes qui advenerant) It contains the last twelve verses of the Gospel of Mark, but on a replacement-page. The original final pages after Mk 15:15 have been lost, and the replacement-page resumes mid-sentence in 16:7 and includes the text to the end of verse 20, but in the Vulgate version. Space considerations suggest that it is unlikely that the original, non-extant pages included verses 9-20, but this calculation (made by C. H. Turner in 1928) depends on unverifiable assumptions that only four pages have been lost, that the scribe did not accidentally skip any text, and that the person who made the replacement-page had access to the missing page that it replaced. However Turner did not explain why a scribe would replace only one of four pages. It is more probable that the replacement-page was removed from another manuscript than that it was made to insert in Codex Vercellensis. The text of Codex Vercellensis is related to the text of Codex Corbeiensis (ff2), another Old Latin copy (in which Mk 16:9-20 is included).
According to a respectable tradition, this codex was written under the direction of bishop Eusebius of Vercelli.
It was restored and stabilised in the early twentieth century. Having been used for the taking of oaths in the early Middle Ages, much of it is either difficult to read or even destroyed, so that we are frequently dependent on the earlier editors for knowledge of its text.
In Matt 27:9 in the sentence fulfilled what was spoken by Jeremiah the prophet, the Codex omits the word Jeremiah (Ieremiam), just like in the manuscripts: Codex Beratinus, Minuscule 33, Old-Latin Codex Veronensis (b), syrs, syrp, and copbo.
In Luke 23:34 it omits the words: "And Jesus said: Father forgive them, they know not what they do." This omission is supported by the manuscripts Papyrus 75, Sinaiticusa, B, D*, W, Θ, 0124, 1241, Codex Bezaelat, syrs, copsa, copbo.
It also has several omissions called Western non-interpolations.
- Giovanni Andrea Irico edition (Sacrosanctus Evangeliorum Codex Sancti Eusebii Vercellensis, 2 volumes, Milan, 1748)
- G. Bianchini edition (Rome, 1749; reprinted in Migne, Patrologia Latina, xii, cols. 141-338)
- J. Belsheim edition (Codex Vercellensis, Christiania, 1897)
- A. Gasquet edition (Codex Vercellensis, Collectanea biblica Latina, iii; Roma, 1914)