840
840 — China: Uyghur Khaganate enters decline in the aftermath of civil war / Japan: Nihon Kōki (3rd volume of historical chronicles Rikkokushi) was completed
5 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.
| KoreaNorthern and Southern States period 698–918 | ChinaTang dynasty 618–907 | JapanHeian period 794–1185 | United States |
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- No events recorded for this year
- 838신라 민애왕 즉위
- 839신라 문성왕 즉위
- 839신라 장보고의 도움으로 신무왕 즉위
| - Uyghur Khaganate enters decline in the aftermath of civil war
- February — Emperor Wenzong of Tang dies; his brother Li Chan is placed on the throne by eunuchs and becomes Emperor Wuzong of Tang
- February — Wenzong's brother Emperor Wuzong of Tang became emperor of the Tang dynasty.
- February — Wenzong died.
- 838Japanese monk Ennin visits China
- 841唐武宗即位，是為會昌中興。
- 842Tibetan Empire enters decline after the death of Dharma
| - Nihon Kōki (3rd volume of historical chronicles Rikkokushi) was completed.
- 839Last envoy to Tang China sent (some later embassies were cancelled).
- 842Jōwa Incident
- 842Emperor Montoku ascends to the throne.
| covered from 1607 |