Qasar Qaghan
{{Sources exist|date=October 2019}}
{{Infobox monarch||name=Qasar Qaghan|title=|image=|caption=|reign=839-840|coronation=|full name=|predecessor=Zhangxin Qaghan|successor=Wujie Qaghan|spouse=|issue=|royal house=|dynasty=|father=|mother=|birth_date=|birth_place=|death_date=840|death_place=|date of burial=|place of burial=|succession=Khagan of Uyghurs|regnal name=|birth_name=|religion=|posthumous name=}}Qasar Qaghan ({{zh|t=㕎馺可汗}}) was the twelfth qaghan of Uyghurs.
Reign
According to Japanese researcher Haneda Toru (羽田亨) he was the same person as Uyghur general Jueluowu (掘羅勿) who rebelled against Zhangxin Qaghan.Haneda Toru, Research on Uighur History in the Tang, p. 287-289 However, according to Michael Drompp, Qasar was a puppet ruler who was raised to the throne by Jueluowu.{{Cite book|title=Tang China and the collapse of the Uighur Empire : a documentary history|last=Drompp, Michael Robert, 1953-|date=2005|publisher=Brill|isbn=9004141294|location=Leiden|pages=35|oclc=56318277}} In any case his reign was very brief. Against usurpation, Uyghur general Külüg Bagha ({{Lang-zh|c=句禄莫和|s=|t=|p=Jùlù Mòhé}}) fled to Yenisei Kyrgyz and appealed for help. Apart from war, there was a major plague and major snow storm, causing great deaths of the Uyghur livestock and leading to its sudden decline of the state. Using opportunity, Külüg Bagha and 100000 Kyrgyz forces invaded Ordu-Baliq and burned the city. Qasar and Jueluowu were killed by a Kyrgyz leader titled Ā-rè (阿熱; Middle Chinese: /ʔɑ-ȵiᴇt̚/ < *Änäl, phonetic variant of Old Turkic İnäl), who would take the title Qaghan.Alimov, R. (2016) "On the Yenisei Kirghiz tile Ā-Rè" in Acta Orientalia Academiae Scientiarum Hung. Volume 69 (3), pp. 265–283
Aftermath
Following Kyrgyz sack of capital, Uyghur minister Sazhi (馺职) and Pang Tegin (庞特勒) together with fifteen clans went to the land of the Karluk (葛逻禄) for refuge. Another group of refugees fled with Uyghur Prince Wamosi to Tang China.Zizhi Tongjian, vol. 246. A remnant group continued to claim statehood under leadership of Wujie Qaghan.