According to Juvaini, Genghis Khan had originally sent the ruler of the Khwarezmid Empire, Sultan Muhammad Aladdin, a message greeting him as his equal: "We now have the obligations of neighbors. Human wisdom requires that both sides walk the path of concord and observe the duties of friendship."
Mongol invasion of Central Asia, from 1206-1221, Genghis Khan's armies expanded the Mongol Empire after the unification of the Mongol/Turkic tribes.
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