Rejestr listów wypowiednich rycerzy księcia opolskiego Bernarda do wielkiego mistrza zakonu krzyżackiego Michała Küchmeistera z 1414 r.

The article concerns the participation of Opole knights in the Polish-Teutonic War of 1414. The basis for the analysis is the register of letters of declaration which arrived on 19 July in Malbork. This source makes it possible to compare the degree of involvement of individual Silesian dukes (in this case, Prince Bernard) in this conflict and can be the basis for estimating the size of contingents brought by each of them. The letters mention slightly more than 200 knights, which indicates that Bernard was one of the most important Silesian allies of Władysław Jagiełło at that time. Moreover, the prince’s itinerary shows that the prince of Opole and his knights returned to Upper Silesia before the end of the war.