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| Millennium: | 1st millennium |
|---|---|
| Centuries: | 8th century – 9th century – 10th century |
| Decades: | 810s 820s 830s – 840s – 850s 860s 870s |
| Years: | 839 840 841 – 842 – 843 844 845 |
Events
- February 14 – Charles the Bald and Louis the German sign a treaty.
- Oaths of Strasbourg — alliance of Louis the German and Charles the Bald against emperor Lothar — sworn and recorded in vernacular languages.
- Ramiro I succeeds Alfonso II as king of Asturias.
- Uurad is succeeded by Bred, then Ciniod.
- Charles the Bald marries Ermentrude.
- Three year old Michael III succeeds Theophilus (emperor) as emperor of Byzantium.
- End of the reign of caliph Moqtasim.
- Uyghurs leave the Mongolian plateau.
Deaths
- January 5 — Al-Mu'tasim, Abbasid caliph (b. 794)
- Emperor Saga of Japan (b. 786)
- Alfonso II of Asturias (b. 759)
- Theophilus, Byzantine Emperor (b. 813)
- Liu Yuxi, Chinese poet, philosopher, and essayist (born 772)