During the 1200s the emperors of the Holy Roman Empire and the popes of that time had many conflicts. I believe that the main source of these conflicts was greed of power and control. With an emperor ruling over a vastly large kingdom, not taking orders from anyone, and yearning for even more power the pope had little influence on him. The popes did not like anyone questioning their supreme, unrivaled power just like the emperors didn’t enjoy the thought of being controlled by some religious overseer. In the end the popes got their way by not having to deal with an emperor for over ten years.