The idea of writing this first article about the notes made on the cult books from the heritage of the Metropolitanate of Moldavia and Bucovina, came at the moment when as a museographer of the young Metropolitan Museum of Iași, I had to inventory the mobile cultural heritage, which had just been transferred from the concentration warehouse organized by the Metropolis, at the Golia Monastery during the communist period (1980s). On this occasion, I encountered a rich fund of old books (3355 copies), many of them presenting various notes, unique in their own way. These notes are very precious, because they have the merit of bringing information about events, which at the time of their writing had an important value for the person or community in which the book was located, about the identity of the participants in these events and sometimes about the actual circulation of the book. They were made in different areas/places of the books by clerics or laymen with handwriting, in the Romanian language, with the Cyrillic alphabet and later, with the transition and the Latin alphabet. The historical value of these cult books, which the Metropolitanate of Moldavia and Bucovina owns, is doubled by the notes made during the time by the readers and their owners, who, by making these notations, found themselves in oblivion.