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In page Manichaeism:

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Adherents existed in Sogdia in Central Asia.[1][2] Uyghur khagan Tengri Qaghan (759–780) converted to the religion in 763 after a three-day discussion with preachers.[3][4] The Babylonian headquarters sent high-ranking clerics to the Uyghurs, and Manichaeism remained the state religion for about a century before the disestablishment of the Uyghur Khaganate in 840.[citation needed]