The Codex Vaticanus, also known as “B,” is kept at the Vatican Library (Biblioteca Apostolica Vaticana) in Vatican City. It is considered one of the oldest and most valuable manuscripts of the Greek Bible, containing the complete text of the Old and New Testaments, and is written on parchment in a single column.
The manuscript is believed to have been written in the mid-4th century, and it is considered a key source for the study of the Greek New Testament. The Codex Vaticanus is one of the most significant treasures of the Vatican Library and is heavily guarded and protected by the Vatican authorities.