Vatican Secret Archives

The Vatican Secret Archives (Latin: Archivum Secretum Apostolicum Vaticanum; Italian: Archivio Segreto Vaticano) is the central repository in the Vatican City for all of the acts promulgated by the Holy See. The Pope, as Sovereign of Vatican City and having primal incumbency, owns the archives until his death or resignation, with ownership passing to his successor. The archives also contain the state papers, correspondence, papal account books, and many other documents which the church has accumulated over the centuries. In the 17th century, under the orders of Pope Paul V, the Secret Archives were separated from the Vatican Library, where scholars had some very limited access to them, and remained closed to outsiders until 1881, when Pope Leo XIII opened them to researchers, more than a thousand of whom now examine some of its documents each year.

The use of the word "secret" in the title "Vatican Secret Archives" does not denote the modern meaning of confidentiality. Its meaning is closer to that of the word "private", indicating that the archives are the Pope's personal property, not belonging to those of any particular department of the Roman Curia or the Holy See. The word "secret" was generally used in this sense as also reflected in phrases such as "secret servants", "secret cupbearer", "secret carver" or "secretary", much like an esteemed position of honour and regard comparable to a VIP.

Parts of the Secret Archives remain truly secret, however: some materials are still prohibited for outside viewing, including everything dated after 1939.

The Vatican Secret Archives have been estimated to contain 85 kilometres (53 mi) of shelving, and there are 35,000 volumes in the selective catalogue alone. "Indexes must be consulted in the Index Room and replaced in their original location. Publication of the indexes, in part or as a whole, is forbidden." The Archives support their own photographic and conservation studios.

...
Wikipedia