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| 8th century | 9th century | 10th century |
| 810s | 820s | 830s | 840s | 850 | 860s | 870s |
◄◄ | | 836 | 837 | 838 | 839 | 840 | 841 | 842 | 843 | 844 | | ►►

Heads of State · Nekrolog

Lothar I, the eldest son of Ludwig the Pious and his successor in the dignity of emperor, tried to enforce imperial supremacy in the empire from the first endowment of his half-brother Charles the Bald until the Peace of Diedenhofen in 842 and the Treaty of Verdun concluded in 843 Coin of Ludwig the German Charles the Bald, illustration from a manuscript which Liuthard wrote for himself between 842 and 869 in golden uncial scriptAfter the death of Louis the Pious ,
power struggles broke out between his sons in the Frankish Empire .
840 in other calendars
Armenian calendar 288/289 (turn of the year July)
Ethiopian calendar 832/833
Buddhist calendar 1383/84 (southern Buddhism); 1382/83 (alternative calculation according to Buddha's Parinirvana )
Chinese calendar 58th (59th) cycle

Year of the metal monkey庚申 ( at the beginning of the year Earth-Sheep 己未)

Chula Sakarat (Siam, Myanmar) / Dai calendar (Vietnam) 202/203 (turn of the year April)
Iranian calendar 218/219 (around March 21)
Islamic calendar 225/226 (October 30/31)
Jewish calendar 4600/01 (September 1st and 2nd)
Coptic calendar 556/557
Malayalam calendar 15/16
Roman calendar ab urbe condita MDXCIII (1593)

Diocletian's era : 556/557 (New Year November)

Seleucid era Babylon: 1150/51 (turn of the year April)

Syria: 1151/52 (turn of the year October)

Spanish era 878
Vikram Sambat (Nepalese Calendar) 896/897 (turn of the year April)


Politics and world events

Franconian Empire


Tang Wuzong
  • Tang Wuzong , a follower of Daoism , becomes emperor of the Tang Dynasty in China after the death of his brother Tang Wenzong . At the beginning of his rule, the influence of the eunuchs at the Chinese court is so strong that they often make the practical political decisions. However, with the help of his uncle Xuānzong and the Chancellor Li Deyu , Wuzong succeeds in asserting himself against the eunuchs and limiting their influence.
  • The mountain fortress Alamut is built in Dailam .

First documentary mentions


Science and culture

  • The Japanese chronicle Nihon Kōki is completed. It is an official chronicle of Japan for the years 792 to 833. It is the third part of the six official stories of the empire ( Rikkokushi ). Fujiwara no Otsugu is considered to be the editor of Nihon Kōki .


Salvatorkirche and monastery building


Born in 840

  • Aedh , King of Scotland († 878 )
  • Hathumod , Abbess of the Gandersheim Monastery († 874 )

Born around 840


Date of death secured

Exact date of death unknown

Web links

Commons : 840  - Collection of pictures, videos and audio files