Ashina Helu
In 630, Emperor Taizong sent his general Li Jing against the Eastern Turks, defeating and capturing their Jiali Khan Ashina Duobi and destroying their power. This made Tang the dominant power in East and Central Asia, and Emperor Taizong subsequently took the title of "Tengeri Qaghan" (, "Tenger Khan" or the God like Emperor). He also launched a series of campaigns against the oasis states of the Tarim Basin, and against the armies of their main ally, the Western Turks. During his reign, Tang armies annexed Karakhoja in 640, Karasahr in 644 and Kucha in 648. Eventually, the Tang defeated and annexed the Western Gokturk khaganate after Su Dingfang defeated Qaghan Ashina Helu in 657.