Charlemagne was a king of Europe who wanted to establish a Christian empire. In 799, Pope Leo III asked Charles for protection because he had fled from Rome when the Romans threatened to blind the Pope and remove him from office. Charlemagne offered Pope Leo the protection of his empire due to all of the chaos in Rome.
Have you finished constructing the rules?
After a few months, Leo returned home to Rome under the kings protection, and the Pope was so thankful, he crowned Charles "Holy Roman Emperor." This strengthened the church in Western Europe because the now only the Pope could crown an emperor. The Byzantine emperor was upset by this ceremony and there was a split into two churches, the Eastern Orthodox and Roman Catholic churches.
You are now the bishop of Milan.
Charlemagne believed that God had made him emperor in order to do God's work on Earth and he believed that it was the duty of the Pope to assist him in his work. The Pope, on the other hand, believed the church had made Charlemagne emperor and it was the duty of the emperor to assist the church. 200 years later, these different views led to a clash between the emperor and the Pope.
Please forgive me!
You have earned your title back.
In 1073, Pope Gregory issued a list of rules declaring his supreme authority over the church and secular. He declared that the Pope alone had the power to remove emperors from the throne. King Henry IV believed that the rules were a direct attack on his own power and rights and fought back.
The conflict started when Henry ignored the Pope's rules and named his own bishop for the city of Milan. To counter, Pope Gregory appointed a rival bishop in return for Henry disobeying his rules. As the clash went on, Henry even tried to remove Pope Gregory from office. Due to this, the Pope excommunicated Henry from the church.
King Henry waited outside of the church for 3 days before the Pope would see him. In the church, Henry begged for forgiveness and got the title of "Holy Roman Emperor" back. He took revenge on Pope Gregory by storming an army and forcing him from office. The Concordat of Worms gave the Pope power to appoint bishops but the kings could give fiefs of land. It was made in order to keep peace and stable out the power, but the conflicts continued.