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The Pope and emperor fought for power. The Pope thought that there were two swords. One religious and one political. He also thought that the emperor should bow to him for religious matters, and that he should bow to the emperor for political matters.
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Christians must follow the canon law, or face excommunication.
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Due to the insatisfaction over lay investiture, kings and nobles appointing church officials, the Pope bans it, and excommunitcates Henry IV.
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Henry IV crosses the snowy Alps in order to ask Pope Gregory for forgiveness.
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The Concordat of Worms was the compromise between the Emperor and the Church.
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Frederick is chosen to become king of the Holy Roman Empire.
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The Battle of Legano was an important battle that led to the Holy Roman Empire's downfall.
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After losing at the Battle of Legano, Frederick makes peace with the Pope, and returns to Germany.
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Due to Frederick's death, the Holy Roman Empire begins to fall.
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Charlemagne is crowned emperor by Pope Leo III.
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Otto I or Otto the Great was one of the most effective emperors, and made close alliances with the pope and clergy.
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Otto invades Italy for the Pope.
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German-Roman Empire became known as the Holy Roman Empire. This was when the empire was at its strongest.
