A cikin 1226, Konrad I, Duke na Masovia a arewa-maso-gabashin Poland , ya yi kira ga Knights don kare iyakokinsa da kuma mamaye arna na Baltic Old Prussians, yana barin Teutonic Knights amfani da Chełmno Land a matsayin tushe don yakin su.Wannan lokaci ne da ake yaɗuwar ƙwazo a yammacin Turai, Hermann von Salza ya ɗauki Prussia a matsayin kyakkyawan filin horar da jagororinsa na yaƙe-yaƙe da musulmi a Outremer.Tare da Golden Bull na Rimini, Sarkin sarakuna Frederick II ya ba da umarnin gata ta musamman ga cin nasara da mallakar Prussia, ciki har da Chełmno Land, tare da ikon mallakar papal na musamman.A cikin 1235 Teutonic Knights sun haɗa ƙaramin odar Dobrzyń, wanda Kirista, Bishop na farko na Prussia ya kafa a baya.