Barchuq Art Tegin (Chinese: 巴而朮·阿而忒·的斤; known also as Idikut Baurchuk, Idikut Barchuq) was a ruler, with a title of Idiqut ("Lord of happiness"), of the Qocho in Beshbalik (near present-day Ürümqi, China), Kara-Khoja (near present-day Turpan, China, known also as Idikut-Shahri), Kumul, Kucha and Karasahr between 1208 and 1235.
During the following year or two, Baurchuk mounted military expeditions against Naimans and killed four sons of their ruler Dayan Khan.
[1] In September 1219, Baurchuk joined Genghis Khan in an attack against the Khwarezmian Empire, personally commanding 10,000 tuman troops and taking part in the siege of Otrar and Nishapur[2] (razed to ground by Mongols).
In the spring of 1226, he took an active part in the two-year Mongol expedition against the Western Xia led by Genghis Khan himself and completed in almost full annihilation of the Tangut people, who were declared to be responsible for Genghis Khan's death under the walls of besieged Tangut capital,[3] in September, 1227.
The population of the Western Xia was reduced from around 3,000,000 people to less than one hundred thousand, which eventually had been assimilated by other ethnic groups, mostly of Mongolic, Turkic and Tibetan origins.