character: Frederick Barbarossa
topic: Power struggles involving Pope Alexander III and Henry VI
grade: 11
subject: History
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character: Pope Alexander III
topic: Conflict with Frederick Barbarossa
grade: 11
subject: History
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character: Henry VI
topic: Role in the struggles with Pope Alexander III
grade: 11
subject: History
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character: Frederick I, Holy Roman Emperor
topic: Influence during the papal conflicts
grade: 11
subject: History
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