From time to time, a rare monument will appear in some archives, filling the gap in previous research. Such a "discovery" was the identification of a hitherto unnoticed manuscript from Bratislava as a medieval missal associated with the cathedral in Lund. From the given period, it is the only complete manuscript that documents the liturgical and musical tradition of the Archdiocese of Lund. In the first part of the publication, the authors present the results of their research in the field of codicology, musical paleography, as well as musicological and liturgical analyses and comparisons. The second part consists of facsimiles with registers of songs, lessons, and prayers. This book aims to initiate further research into the medieval liturgy in Scandinavia and Europe as a whole.