the Breviarium sancta Clarae is a medieval manuscript of almost three hundred papers kept in the convent of San Damiano, in Assisi: a composite breviary-missal, in which the various parts are mixed up and not always easy to reconstruct. There are texts for the Liturgy of the Hours, enriched by a well-kept psaltery and hymns embellished with musical notation, texts for the Mass, with the proper and common ones of the feasts of the saints, the Office of the dead. There are also passages from the Vita Prima by Tommaso da Celano, for the office of Saint Francis, and the Regola stamped of 1223. From textual elements (the absence or reference to some feasts, the presence or absence of some prayers) or palaeographic, scholars have been able to date the codex between 1230 and 1234.