Centuries:	8th century - 9th century - 10th century
Decades:	810s  820s  830s  - 840s -  850s  860s  870s
Years:	839 840 841 - 842 - 843 844 845

842 by topic v • d • e

Politics

State leaders - Sovereign states

Birth and death categories

Births - Deaths

Establishment and disestablishment categories

Establishments - Disestablishments

842 in other calendars

Gregorian calendar	842 DCCCXLII
Ab urbe condita	1595
Armenian calendar	291 ԹՎ ՄՂԱ
Bahá'í calendar	-1002 – -1001
Berber calendar	1792
Buddhist calendar	1386
Burmese calendar	204
Byzantine calendar	6350 – 6351
Chinese calendar	辛酉年十一月十六日 (3478/3538-11-16) — to — 壬戌年十一月廿六日 (3479/3539-11-26)
Coptic calendar	558 – 559
Ethiopian calendar	834 – 835
Hebrew calendar	4602 – 4603
Hindu calendars
- Vikram Samvat	897 – 898
- Shaka Samvat	764 – 765
- Kali Yuga	3943 – 3944
Holocene calendar	10842
Iranian calendar	220 – 221
Islamic calendar	227 – 228
Japanese calendar
Korean calendar	3175
Thai solar calendar	1385
v • d • e

Events

By Place

Europe

• February 14 - Charles the Bald and Louis the German sign a treaty.
• Cerball mac Dúnlainge becomes king of Osraige
• The Oaths of Strasbourg — an alliance of Louis the German and Charles the Bald against emperor Lothar — are sworn and recorded in the vernacular languages.
• Ramiro I succeeds Alfonso II as king of Asturias.
• Uurad is succeeded by Bred, then Ciniod as King of the Picts.
• Charles the Bald marries Ermentrude.

Byzantine Empire

• Three year old Michael III succeeds Theophilus (emperor) as emperor of Byzantium.

Asia

• The reign of caliph Moqtasim ends.
• The 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 (b. 772)