In the Middle Ages of Europe, there were kings and Popes, they had the most power. Unfortunately, no one could agree on the who got what power, and in the tale of King Henry the IV and Pope Gregory the VII, it's the perfect story to portrait the issue.
As King Henry the VI, I appoint the church this new Bishop.
Why does he get to choose the Bishop!! That's not fair, I'm the Great Pope Gregory!!!
Oh yeah? Well, now under my command, Germany's bishops are going to FIRE you!!
I fire, I mean, excommunicate you, so don't bother coming to church anymore, you're banned!
Three days later...
Fine, you can come back to church! You're so annoying.
PLEASE FORGIVE ME!!! My feet really hurt! I don't even have shoes on!
Who goes barefoot in the snow?
Although the King and Pope "made up" The fight for who chose the Bishop even after their death. Many years later, a different king and pope fixed the problem came to an agreement where the church officials chose the bishops. THere were still many disagreements henceforth.
Why couldn't we have been the ones to fix the problem, it's all your fault!