There are different theories on the tribal identity of Bilge Kul khagan. According to Western and Kazakh historiographies, he was a ruler of
Isfijab, a descendant of the
Karluk yabghu. Alternatively, he was from the Edgish tribe, a part of the
Chigils or a
Yagma. According to
Pritsak, he claimed the title "Khaqan" after the fall of
Uyghur khaganate since he was from the
Ashina dynasty. However, Wei Liangtao claims that he was, in fact, Pang Tegin, a ruler of remnants of the Uyghur ruling dynasty in
Khotan. Qian Baiquan doubted that. == References ==