Emperor Gaozu of Tang
Gao Kaidao (高開道) (died 624), at one point known as Li Kaidao (李開道), was an agrarian rebel leader who rose against Sui Dynasty rule at the end of Emperor Yang's reign. He occupied the region centering Huairong (懷戎, in modern Zhangjiakou, Hebei) and claimed the title of Prince of Yan, in alliance with the Eastern Turkish Khaganate ("Dong Tujue"). In 620, he briefly submitted to Emperor Gaozu of Tang and was bestowed the imperial surname of Li, but in 621 he rebelled against Tang and reasserted independence. In 624, his general Zhang Jinshu (張金樹) started a coup and he, realizing that the coup was about to succeed, committed suicide.