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Charles Martel led the Franks against the Muslims which stopped the Muslim advance into Europe and Christianity remained Europe's major religion.
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Pope Urban II called Europeans together to fight to regain the Holy Land from the Muslim Turks who had taken it from the Arab Muslims. The TUrks made pilgrimage for Christians unsafe.
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Charlemagne had impressed the pope with his conquests of lands and conversions of people to Christianity, so he had him crowned Holy Roman Emperor. Charlemagne set up courts and schools in his empire.