character: Frederick Barbarossa
topic: Conflict with Pope Alexander III
grade: 11
subject: History
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character: Pope Alexander III
topic: Disputes with Holy Roman Emperors
grade: 11
subject: History
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character: Frederick Barbarossa
topic: Investiture Controversy
grade: 11
subject: History
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character: Pope Alexander III
topic: Role in the Concordat of Venice
grade: 11
subject: History
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