The medieval history of the monastery appears in the "Chronicon Vulturnense", an illuminated manuscript. A monk of the monastery, Iohannes, composed the "Chronicle" in circa 1130, using sources from the eighth, ninth and tenth centuries which were available to him, probably in the monastery archives, as well as hagiographic inclusions about some of the historic figures. The aims of the "Chronicle" may have been to codify the memory of the community and its history in the face of Norman expansion in southern Italy. The manuscript, written in a Beneventan hand and including numerous images, is housed at the Biblioteca Apostolica Vaticana, BAV Barb. lat. 2724.