Mongolian Invasion and Gradual Decline
The Crusades put the Islamic world under pressure by invasion in the 11th and 12th centuries, but a new and far greater threat came from the East during the 13th century: in 1206, Genghis Khan established a powerful dynasty among the Mongols of central Asia. During the 13th century, this Mongol Empire conquered most of the Eurasian land mass, including both China in the east and much of the old Islamic caliphate (as well as Kievan Rus) in the west. Hulagu Khan's destruction of Baghdad in 1258 is traditionally seen as the approximate end of the Golden Age. Later Mongol leaders, such as Timur, destroyed many cities, slaughtered hundreds of thousands of people, and did irrevocable damage to the ancient irrigation systems of Mesopotamia. Muslims in lands subject to the Mongols now faced northeast, toward the land routes to China, rather than toward Mecca.
Eventually, most of the Mongol peoples that settled in western Asia converted to Islam and in many instances became assimilated into various Muslim Turkic peoples. The Ottoman Empire rose from the ashes, but (according to the traditional view) the Golden Age was over.
Read more about this topic: Islamic Golden Age
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