Pomerania had repeatedly been Polish or independent before joining the Holy Roman Empire in 1180. Gniezno and Magdeburg archdioceses competed for expanding their influence into Pomerania, which is why the Holy See determined Cammin to remain exempt.
Prior to joining the Holy Roman Empire in 1180, Pomerania was under Polish or independent rule. The Archdiocese of Gniezno and Magdeburg competed for control over Pomerania, prompting the Holy See to maintain Cammin's exemption.