It may be said that the Vatican Codex, written in the first half of the fourth century, represents the text of one of those recensions of the Bible which were current in the third century, and that it belongs to the family of manuscripts made use of by Origen in the composition of his Hexapla. The original home of the Vatican Codex is uncertain. A more common opinion maintains that it was written in Egypt. Armitage Robinson believes that both the Vaticanus and the Sinaiticus were originally together in some ancient library. Tischendorf believed that three hands had worked at the transcription of the Vatican Codex.
Old catalogues show that it was there in the fifteenth century.
The addition to the New Testament was listed by Scrivener as Cod. 91 for the Apocalypse. There are various collations, editions, and studies of the Vatican Codex. Many other scholars have made special collations for their own purposes e.g. Tregelles, Tischendorf, Alford, etc. In the second volume of the Catalogue of Vatican Greek manuscripts, executed according to the modern scientific method for the cataloguing of the Vatican Library, there is a description of the Codex Vaticanus.