In 1193, Pope Celestine III urged Christians to have a crusade against the heathens which included the Old Prussians, the Lithuanians and other tribes inhabiting Estonia, Latvia and East Prussia.
En 1193, o papa Celestino III pediu unha cruzada contra os pagáns, que incluíu ós Prusianos, ós Lituanos e outras tribos que habitaban Estonia, Letonia e Prusia Oriental.