The following year Charlemagne traveled to rome to suport the pope .On Christmas Day Pope Leo crowned him emperor. Charlemagne seemed suprized by his coronation.
Charlemagne believed that God made him emperor in order to do God's work on earth. Pope Leo, however believed that church made Charlemagne emperor. It was the duty of the emperor to assist the church in doing God's work on earth.
200 years after Charlemagne's coronation these different views lead to a dramatic clash between an emperor and the Pope. After Charlamagne's empire collapsed the German land's were divided among a number of Dukes. Following Germanic tradition they chose one of their own to be king.
In 1073 a monk named Hildebrand became Pope Gregory VII. He had strong ideas about the powers of the Pope. He issued a list of rules declaring his supreme authority. A holy Roman emperor named Henry IV rejected Pope Gregory VII's new rules. They were a direct attack on his own power and rights and there a clash between them.
The clash began when Henry ignored the Pope's rules and named his own bishop for the city of Milan, Italy. In response Pope Gregory appointed a rival bishop. Henry tried to remove Gregory as Pope. Pope Gregory then excommunicated Henry.
Across Europe members of clergy and secular rules took sides. The power struggle between Pope's and rulers continued long after Gregory and Henry died. Eventually in 1122 the church and the holy Roman Empire reached an agreement called the Concordat of Worms. In the end pope's and rulers continued to have conflicts.