Li Jing (李靖, pinyin: Lǐ Jìng) (571-July 2, 649), né Yaoshi (藥師/药师, pinyin: Yàoshī), formally Duke Jingwu of Wei (衛景武公), was a general and one time chancellor of the Chinese Tang Dynasty. In 630, Li Jing defeated the Eastern Tujue (Göktürk) Jiali Khan Ashina Duobi with just 3,000 cavalry soldiers in a surprise attack, allowing Tang to subjugate Eastern Tujue and reduce it to a vassal state. He and Li Shiji were considered the two most prominent early Tang generals.

Source: Wikipedia