Li Shimin, the future Emperor Taizong of Tang, Emperor of China, ambushes and kills his rival brothers Li Yuanji and Li Jiancheng in the Incident at Xuanwu Gate.

Li Shimin, posthumously known as Emperor Taizong of Tang, assumes the throne over the Tang Dynasty of China.

Emperor Taizong of Tang, the Emperor of China, sends envoys to the Xueyantuo bearing gold and silk in order to seek the release of enslaved Chinese prisoners captured during the transition from Sui to Tang from the northern frontier; this embassy succeeded in freeing 80,000 Chinese men and women who were then returned to China.