› timelines › the_middle_agesThe Middle Ages Timeline - Softschools.com Along with barbarians from the north, Muslims begin to conquer lands from the south. Charles Martel, the Frank king, stops the Muslims' northward push in 732. 768 A.D. Charlemagne rules (768 - 814 A.D.). Charles Martel's grandson, Charlemagne, becomes the new Frank king. He desires to spread Christianity. As he conquers land, he extends his faith.