The aim of the paper is to attempt to show the scope and nature of contacts between the faithful from the Krakow diocese and the Holy See in the 15th century. Analyses of sources should indicate which groups dominated. This should bring us closer to answering questions about the scope of their contacts and activities. In turn, the nature of the cases reported should, on the one hand, show the level of knowledge and awareness of the norms of canon law, and on the other hand, highlight the problem of the involvement of the faithful in the religious life of their parish. This should also provide an answer to the next question, whether access to the Roman Curia was a limit for the faithful from the Krakow diocese that they were able to cross. Considering the above issues through the prism of not only individuals or institutions, but also the papacy itself, we can subject the thesis put forward by the organizers to deeper reflection, that medieval Europe was a Roman state, ruled by popes.