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Pope Gregory excommunicated him because Henry IV, a German Emperor, was furious with the banning of lay investiture
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He wanted to win the Pope's frogiveness
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resumed Holy Empire
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the foot soldiers of the Lombard League faced Frederick's army of mounted knights
Lombard League won -
Frederick made peace with the Pope and returned to Germany
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Frederick drowned and died
His empire fell to pieces -
He was crowned by Pope Leo
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sons name was Louis the Pouis
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divides the empire into 3 kingdoms
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also called Otto the Great
He established the Holy ROman Empire