644
644 — China: Emperor Taizong of Tang starts preparations for a campaign against Goguryeo
3 events. The text is the source chronology verbatim; the terms are in Sources & licenses. The grey lines above and below are the surrounding 2 years.
| KoreaThree Kingdoms of Korea 57 BC–660 | ChinaTang dynasty 618–907 | JapanAsuka period 538–710 | United States |
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- No events recorded for this year
- 642Bojang of Goguryeo, accession
- 642백제와 신라의 대야성 전투에서 백제가 승리
- 642고구려의 연개소문이 정변을 일으켜 정권을 장악, 보장왕이 즉위
- 645당나라가 고구려를 침공, 양만춘이 안시성 전투에서 당 태종의 군대를 대파
- 645First campaign in the Goguryeo–Tang War.
| - Emperor Taizong of Tang starts preparations for a campaign against Goguryeo
- Tang campaigns against Karasahr: Tang general Guo Xiaoke attacks Karasahr and achieves military victory but Karasahr remains a vassal of the Western Turkic Khaganate
- Aksu (Gumo) submits to Tang
- 643Crown Prince Li Chengqian is deposed
- 643Taizong commissioned Yan Liben to paint portraits of his officials at Lingyan Pavilion.
- 645Battle of Ansi
- 645Xuanzang returns from India
- 645First campaign in the Goguryeo–Tang War: Emperor Taizong of Tang leads an invasion of Goguryeo in person but withdraws after failure to conquer Anshi (northeast of Yingkou, Liaoning)
- 645July — First campaign in the Goguryeo–Tang War: Tang forces dispersed a Goguryeo army which had arrived in defense of Ansi City.
- 646Bianji compiled the Great Tang Records on the Western Regions.
- 646Emperor Taizong's campaign against Xueyantuo
| - No events recorded for this year
- 645Isshi incident
- 645Emperor Kōtoku, accession
- 645The Asuka period ends with the power of the Soga clan broken in the Isshi incident and Nakatomi clan becoming the dominant power.
- 645中大兄皇子と中臣鎌足による蘇我氏宗家誅滅（乙巳の変）。大化の改新始まる。
- 646January — The Hakuhō period starts with the Taika Reform.
- 646改新の詔
| covered from 1607 |