840年

840年 — 中国: Uyghur Khaganate enters decline in the aftermath of civil war / 日本: Nihon Kōki (3rd volume of historical chronicles Rikkokushi) was completed

出来事5件。本文は原典の年表の原文のままで、出典は出典とライセンスにある。上下の灰色の行は前後2年の文脈だ。

韓国南北国時代 698–918	中国唐 618–907	日本平安時代 794–1185	アメリカ
この年の収録なし 838신라 민애왕 즉위 839신라 문성왕 즉위 839신라 장보고의 도움으로 신무왕 즉위	Uyghur Khaganate enters decline in the aftermath of civil warEN February — Emperor Wenzong of Tang dies; his brother Li Chan is placed on the throne by eunuchs and becomes Emperor Wuzong of TangEN February — Wenzong's brother Emperor Wuzong of Tang became emperor of the Tang dynasty.EN February — Wenzong died.EN 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.EN 839Last envoy to Tang China sent (some later embassies were cancelled). 842承和の変 842Emperor Montoku ascends to the throne.	1607年〜収録

韓国南北国時代 698–918

中国唐 618–907

日本平安時代 794–1185

アメリカ

この年の収録なし

838신라 민애왕 즉위
839신라 문성왕 즉위
839신라 장보고의 도움으로 신무왕 즉위

Uyghur Khaganate enters decline in the aftermath of civil warEN
February — Emperor Wenzong of Tang dies; his brother Li Chan is placed on the throne by eunuchs and becomes Emperor Wuzong of TangEN
February — Wenzong's brother Emperor Wuzong of Tang became emperor of the Tang dynasty.EN
February — Wenzong died.EN

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.EN

839Last envoy to Tang China sent (some later embassies were cancelled).
842承和の変
842Emperor Montoku ascends to the throne.

1607年〜収録