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Henry IV, a German Emporer, was furious with the banning of lay investiture
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For excommunication and he wanted to win the pope's forgiveness
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He also resumed Holy Roman Empire
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Frederick 's army of mounted knights fought the Lombard League at the Battle of Legnano; Lombard League won.
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Frederick made peace with the pope and returned to Germany
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Frederick drowned and his empire fell to pieces
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Crowned by Pope Leo III
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His only surviving son Louis the Pious
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This divides the empire into 3 kingdoms
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He established the Holy Roman Empire