Have you ever heard of the separation between church and state? In the middle ages this did not exist yet. The Pope was more powerful than the emperor.
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Large armies marched from Europe towards Jerusalem, to drive the Muslims out of Jerusalem and spread Christianity. These tours are called crusades. Knights, oathmen, but also simple people went on a crusade.
Have you ever heard of the separation between church and state? In the middle ages this did not exist yet. The Pope was more powerful than the emperor.