character: Pope Gregory VII
topic: Support for Matilda against Barbarossa
grade: 11
subject: History
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character: Emperor Frederick I (Barbarossa)
topic: Conflict with Pope Gregory VII
grade: 11
subject: History
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character: Matilda of Tuscany
topic: Ally of Pope Gregory VII against Barbarossa
grade: 11
subject: History
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character: Henry IV of Germany
topic: Struggles with Pope Gregory VII and Barbarossa
grade: 11
subject: History
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