Wikipedia
Kül-chor
Kül-chor, known in Arabic sources as Kūrṣūl and identified with the Baga Tarkhan of the Chinese records, was one of the main Turgesh leaders under the khagan Suluk. His is chiefly known for his role in the Turgesh wars against the Umayyad Caliphate in Transoxiana, and for being responsible for the murder of Suluk in 738, precipitating the collapse of Turgesh power. After eliminating his rivals, he rose to become khagan himself, but soon fell out with his Chinese backers and was defeated and executed in 744. Some Arabic sources, however, record that he was killed by the Arabs in 739.