ABSTRACT
What was it all about? Why was so much energy and resources put into crusading? What was the danger to be opposed? The reform-eager Gregorian Church at the end of the 11th century reached a high point in the middle and late 13th century, and its efforts were directed against both infidels and against sinners within Christianity who brought the whole crusader movement into danger. It was, therefore, logical that it had to take action against those whom the theoreticians of the reform movement considered lukewarm and uncaring about the truth. These were different forms of blended religions, syncretism or even just a form of peaceful co-existence.
