The author presents the manuscript from the circle of Poznan cathedral found in the collections of the Jewish Museum in Prague. It is a copybook of the College of Cathedral Vicars from Poznan (the so-called 'Jura vicariorum') from the 15th-17th century. Until 1939 it was stored in the collections of the Poznan Archdiocesan Archives, then taken away by the Germans and after 1945 regarded as lost. The volume includes numerous copies of documents from the 13th-17th centuries (with the majority from the 15th c.) and is of utmost importance for the history of Poznan and Great Poland (Wielkopolska) in the late Middle Ages.