The earliest version of the mid-13th century Book of Lubiąż, now in the keeping of the State Archives in Wrocław, contains a entry on the Cistercian convent at Byszewo-Koronowo. The note is later than the Book itself: it was written in the second half of the 14th century. It mentions seven documents issued by Władysław Odonic, Pope Gregory IX and the archbishops of Gniezno, Wincenty and Pełka, and handed over to the Byszewo convent. The note contains the day date of its composition, 5 April 1372. It mentions also seven other documents (their copies were marked with the letter ‘a’ and a cross in the Book of Lubiąż) that were not transferred to Byszewo-Koronowo. All the documents refer to donations of land, tithes and German Law jurisdiction in the area of Nakło and Wieleń on the Noteć. Lubiąż was the parent monastery of Byszewo. Consequently Lubiąż Abbey had a supervisory role with regard to the Byszewo-Koronowo conventand that must have been the main reason why the Byszewo note found its way into the earliest version of the Book of Lubiąż. Thanks to their policy of tithe consolidation, the Cistercians of Byszewo-Koronowo became the recipients of practically all the tithes in the Castellanium of Nakło. Meanwhile the Lubiąż convent held vast tracts of land along the Noteć around Nakło and Wieleń. The land was mostly wild and waiting for settlers. But due to the considerable distance from Lubiąż, the colonisation programme made very little headway. Inconsequence, Lubiąż handed over that strip of land to theirbrethren at Byszewo-Koronowo. The transfer of land and documents containing the relevant property titles in 1372 may have been connected with problems encountered by Byszewo-Koronowo in collecting tithes and enforcing its entitlements.The partial devastation of the Byszewo-Koronowo convent in the course of raids of the Teutonic Knights in 1409-1410 led to the return of the batch of documents to Lubiąż. This fact is reported by another entry in the Book of Lubiąż.