Medieval Islamic History
In 600 AD, West Asia had been divided for centuries between two big empires, the Romans and the Sassanians, and people probably thought that would continue more or less forever. But they were wrong. Both the Romans and the Sassanians had gotten in the habit of using mercenary soldiers from the Arabian Peninsula to fight their battles, and in the 600s AD the Arab soldiers formed an army under their leader Mohammed and the new religion of Islam and unified the Arabian Peninsula. Under Mohammed's successors, the Umayyad Caliphs, this army left the Arabian Peninsula and attacked first the Romans and then the Sassanians.
By 640 (after the death of Mohammed) the Arabs controlled most of West Asia, and soon after that, under the rule of the Umayyad caliphs, they conquered Egypt. By 711 AD, the Umayyads controlled all of West Asia except Turkey (which was still part of the Roman Empire), and all of the southern Mediterranean: Egypt, Libya, Tunisia, Algeria, Morocco, and most of Spain. Soon they added Pakistan and Afghanistan. In 732, an Arab army invaded southern France, but the French ruler Charles Martel turned them back at the Battle of Poitiers, and killed their general. Nearly twenty years later, in 751, the Arab army (with their ally Tibet) attacked China, at the opposite end of Asia, but the T'ang Dynasty Chinese army turned the Arab army back at the Battle of Talas.
Still, by the middle of the 700s AD, the Islamic Empire covered most of the Mediterranean coast and West Asia, and part of Central Asia. Thanks to the Silk Road trade that went through their empire, connecting China, Central Asia, and India with East Africa and Europe, the Islamic Empire was powerful and wealthy. New crops - cotton, sugar, lemons - were also helping the Islamic Empire's economy. People must have thought that the Islamic Empire, too, would last a long time. But the Turks and Mongols of Central Asia had different ideas.
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