Vatican Library

Vatican Library (バチカン図書館) is the library of the Holy See, currently located in the Vatican. It is one of the oldest libraries in the world and contains one of the most significant collections of historical texts.

Stiyl Magnus of Necessarius mentions that Index has been to the island prior to the start of the first volume in the timeline alongside the Mont Saint-Michel Abbey, the Pataliputra ruins, Château de Compiègne, and Louvre Museum. There is apparently a grimoire or more sealed in the abbey which cannot be taken away.

The Roman Catholic Church somehow acquired the Book of the Law and locked it inside the library.