The circulation of the De XII abusiuis saeculi among thirteenth-century Franciscans was so intense that it is not entirely surprising to find a new version appearing at the time when the Observants took hold of the books of the Spirituals in the early fifteenth century. The item we shall discuss in this final chapter features in the codex Siena, Biblioteca Comunale degli Intronati, MS U.V.5. This small size volume was entirely copied and annotated by Bernardino da Siena himself (1380–1444) at an early stage of his preaching career, probably in the first part of the 1420s. After some extracts from Bonaventure's De triplici via and Itinerarium mentis in Deum, it comprises a series of excerpts from a large array of writings by the main Spiritual Franciscan authors: Peter John Olivi, Ubertino da Casale, Jacopone da Todi and Ugo Panziera. Olivi is by far the most frequently represented writer in a collection that reflects the contents of a remarkable selection of prohibited texts to which Bernardino had access.

It has long been noted that the early Italian Observant theologians and preachers, and in the first place, Bernardino, made abundant use of the writings of the Spirituals, especially Olivi and Ubertino. The way in which they could access those works is less often stressed. Throughout the fourteenth century, dissident groups carefully kept at hand the documents that defined the basis of their opposition to the papacy and the Franciscan hierarchy, after they had broken their allegiance to John XXII and the leaders of the Order.