Man - I

The Investiture Controversy = The Order of Kings has long had a love / hate relationship with the Order of Priests. Each Order has repeatedly tried to assert its full authority over the other, and in return the other has retaliated in kind. The historical truth of the matter is that the Kings wield earthly, political power, where else the Priests wield the power of belief, of holy mother church.
-http://en.wikipedia.org/wiki/Investiture_Controversy