In the six centuries since the birth of Islam, the religion had expanded greatly and lost control of a few border zones, but never had so much of the Muslim world fallen under the rule of pagans. The four decades from Genghis Khan’s attack on Bukhara until the fall of Baghdad and Damascus represented the lowest point in Muslim history. While the Crusaders had only managed to take a toehold in a few ports, the Mongols conquered every Muslim kingdom and city from the Indus River to the Mediterranean. They had conquered almost all of the Muslim lands in Asia; only the Arabian Peninsula and North
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