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The Mongol Empire conquered the Qara Khitai (Western Liao Empire) in the year 1218 AD. Prior to the invasion, war with the Khwarazmian Empire and the usurpation of power by the Naiman prince Kuchlug had weakened the Qara Khitai. When Kuchlug besieged Almaliq, a city belonging to the Karluks,

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