グレゴリウス改革
The double election was a result of the growing tensions inside the College of Cardinals concerning the policy of the Holy See towards the Holy Roman Empire, initiated by the Concordat of Worms (1122), which ended the investiture controversy. Several, particularly older, cardinals considered the compromise achieved in Worms as desertion of the principles of the Gregorian Reform, and inclined to accept it only as a tactical move. They supported the traditional alliance of the Papacy with the Normans in southern Italy. Some of them were connected to old monastic centers in Southern Italy such as Montecassino. One of their leaders was Cardinal Pierleoni, representative of one of the most powerful families of Rome.