The Diocesan Archives in Kielce keeps a manuscript unknown to a wider circle of researchers, entitled “Mortuologium seu Calendarium ...” by Timotheo Kaffka. It probably found its way into the collection of the said archives following the cassation of the Bernardine monastery at Karczówka in 1864. The manuscript, inconspicuous in appearance, contains information on the history of the Friars Minor, both the older branch – the Conventual Franciscans, the Observants (the Reformati) and the Bernardines. Mortuologium, as a work of commemorative nature, constitutes a universal type of written source, typical of the monastic Latin culture. Franciscan calendars are no exemption to this rule. Therefore, the following publication supplemented with the source appendix in the form of the list of generals OFM unpublished so far, may become both an important contribution to the existing literature on the subject and continuation of the research into the writing culture of the Polish Bernardines.