Chełmno Land
In 1206, the Cistercian bishop Christian of Oliva, with the support of the King of Denmark and Polish dukes, found colonization of the natives in a better state than expected upon his arrival in the war-torn Chełmno Land. Inspired, he travelled to Rome to prepare for a larger mission. When he returned to Chełmno in 1215, however, Christian found the Prussians hostile out of outrage at the genocidal actions of the Sword-Brothers in Livonia or fear of Christian Polish expansion. The Prussians invaded Chełmno Land, and Pomerellia, besieged Chełmno and Lubawa, and enabled Christian converts to return to their native, pre-Christian beliefs.