The Battle of Qatwan (Chinese: 卡特萬之戰) was fought in September 1141 between the Qara Khitai (Western Liao dynasty) and the Seljuk Empire and its vassal-state the Kara-Khanid Khanate. The battle ended in a decisive defeat for the Seljuks, signaling the beginning of the end of the Great Seljuk Empire.
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