character: Pope Callixtus II
topic: Concordat of Worms
grade: 11
subject: History
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character: Henry V, Holy Roman Emperor
topic: Role in the Concordat of Worms
grade: 11
subject: History
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character: Investiture Controversy
topic: Background of the Concordat of Worms
grade: 11
subject: History
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character: Pope Gregory VII
topic: Influence on the Concordat of Worms
grade: 11
subject: History
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