Medieval church paintings are an important part of our country's cultural heritage. Not only the images but also the integrated texts, usually in Latin, provide valuable information about the underlying medieval concepts and ideas. While the pictorial representations have to a large extent been treated in art history, the texts of the language tapes have only been documented to a limited extent. Nor have they been examined philologically, except in exceptional cases. For our time, however, they often constitute a key to the interpretation of the paintings and their function and thus deepen our understanding of the works and their authors. This is clearly illustrated by the only example of Albertus Pictor that has already been studied. A similar pioneering work is therefore urgently needed for other church painters in late medieval Upper Sweden, with the new challenges this disparate material poses in terms of time and execution. The current project aims to examine the texts of such church painters in 80 churches in Uppland, a politically and ecclesiastically central region at that time. The work will result in a linguistically elaborate edition with translation, comments and individual and summarizing analyses of all preserved language tapes. Thus, the results of the project will significantly increase the knowledge of a long-neglected genre in medieval Latin and promote the accessibility of this textual treasure also for researchers in related fields as well as for the interested public.