Xiongnu
The Kyrgyz khagans claimed descent from the Chinese general Li Ling, grandson of the famous Han dynasty general Li Guang. Li Ling was captured by the Xiongnu and defected in the first century BCE. And since the Tang royal Li family also claimed descent from Li Guang, the Kirghiz Khagan was therefore recognized as a member of the Tang Imperial family. This relationship soothed the relationship when Kyrgyz khagan Are (阿熱) invaded Uyghur Khaganate and put Qasar Qaghan to the sword. The news brought to Chang'an by Kyrgyz ambassador Zhuwu Hesu (註吾合素).