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Abaoji, chieftain of the Yila tribe, is named khagan of the Khitans.

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Abaoji
Emperor of the Liao dynasty from 916 to 926
Abaoji, posthumously known by his temple name as the Emperor Taizu of Liao, was a Khitan leader and the founding emperor of the Liao dynasty of China, ruling from 916 to 926. He had a sinicised name, Yelü Yi; some sources suggest that Abaoji's family name, Yelü, was adopted…Source: Wikipedia (CC BY-SA)
Khagan
Imperial title of Mongolic and Turkic societies
Khagan or Qaghan is a title of imperial rank in Turkic, Mongolic, and some other languages, equal to the status of emperor and someone who rules a khaganate (empire). The female equivalent is Khatun.Source: Wikipedia (CC BY-SA)
Khitan people
Nomadic people who founded the Liao dynasty in China
The Khitan people were a historical nomadic people from East Asia and parts of North Asia who, from the 4th century, inhabited an area corresponding to parts of modern Mongolia, Northeast China and the Russian Far East.Source: Wikipedia (CC BY-SA)
February 27
Day of the year
February 27 is the 58th day of the year in the Gregorian calendar; 307 days remain until the end of the year.Source: Wikipedia (CC BY-SA)