character: Frederick I of Germany
topic: Imperial Power and Papacy
grade: 11
subject: History
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character: Pope Alexander III
topic: Conflict with Frederick I
grade: 11
subject: History
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character: Henry IV
topic: Investiture Controversy
grade: 11
subject: History
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character: William I of England
topic: Impact of Papacy on European Politics
grade: 11
subject: History
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