Within the Abbey complex, is situated the library-one of the eleven National Monuments added to – with attached File whose origins date back to the establishment of the monastery (sec. XI) to the need to provide books to monks, as is the rule of St. Benedict. The store, located in two halls of the late 18th century are valuable parchment manuscripts and includes paper, more than fifteen thousand scrolls, the oldest of which is the a.d. 792 Among most popular codes include: the Bible of the IX century Visigothic, Codex legum Langobardorum of the eleventh century, the Etymologiae of Isidore of 8th century, De Temporibus of Bede of eleventh century and De septem sigillis of Benedict XII century from Bari , to which monks margins annotarono most important events of the Abbey and of the contemporary world. These marginal notes are the Annales Cavenses, published several times. As for scrolls, private documents are sorted in chronological order and placed in the diplomatic room in arche of which each contains 120 scrolls while the public documents are located in the Ark magna over seven hundred in number. Documents already published in Codex Diplomaticus Cavensis belong to the years 792-1080 and I am exactly 1669. The consultation is made easy to scholars from a Regestum Pergamenarum. The adjoining library, distributed in three rooms, has over 80,000 volumes with numerous incunabula and sixteenth major. The sciences most represented are the patristic theology, law and especially the story.