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  Through defeating the Moors, Charles stopped Islamic conquest in western Europe.
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  Clovis was a significant king because, through converting to Christianity, he unified his empire and spread Catholicism.
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  Through converting to Christianity, Clovis united his empire and spread Catholicism.
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  Charlemagne had various achievements such as expanding the empire, building schools, spreading Christianity, and aiding the pope.
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  Though Empress Irene could have been in power, the pope did not trust a female with this important title, so he crowned Charlemagne. This was significant, as nobody had been given this title in the last four hundred years.
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  Charlemagne's grandchildren (or Louis the Pious' sons) fought for power, leading to the signing of this treaty, thereby dividing the empire into three.