character: Pope Alexander III
topic: Disputes with Holy Roman Emperors
grade: 11
subject: History
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character: Frederick Barbarossa
topic: Conflict with Pope Alexander III
grade: 11
subject: History
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character: Henry VI
topic: Struggle for Power with Pope Alexander III
grade: 11
subject: History
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character: Papal Authority
topic: Challenges from Holy Roman Emperors during Alexander III's Papacy
grade: 11
subject: History
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