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This article is about the year 842. For the number, see 842 (number).
|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|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1595|
|Chinese calendar||辛酉年 (Metal Rooster)
3538 or 3478
— to —
壬戌年 (Water Dog)
3539 or 3479
|- Vikram Samvat||898–899|
|- Shaka Samvat||764–765|
|- Kali Yuga||3943–3944|
|Japanese calendar||Jōwa 9
|Minguo calendar||1070 before ROC
|Seleucid era||1153/1154 AG|
|Thai solar calendar||1384–1385|
- January 20 – Emperor Theophilos dies of dysentery at Constantinople after a 12-year reign. He expends much effort defending the eastern frontier against the invading Muslim Arabs. Theophilos is succeeded by his 2-year-old son Michael III, with his mother Theodora, who becomes regent and the 'temporary' sole ruler of the Byzantine Empire.
- February 14 – Oaths of Strasbourg: King Louis the German, ruler of East Francia, and his half-brother Charles the Bald, ruler of West Francia, meet with their armies at Strasbourg. They agree to swear allegiance (recorded in vernacular languages) to each other and to support each other against their brother Lothair I. Nominally, emperor of all the Frankish kingdoms and the Holy Roman Empire.
- March 20 – King Alfonso II of Asturias (Northern Spain) dies after a 50-year reign. He has undertaken numerous campaigns against the Muslim armies of the Umayyad Emirate of Córdoba and allied himself with the late Charlemagne. The childless Alfonso chooses Ramiro I, son of former king Bermudo I, as his successor.
- Uurad of the Picts dies after a 3-year reign and is succeeded by his son Bridei VI, who contests his power with rival groups led by Bruide son of Fokel and Kenneth MacAlpin.
- January 5 – Caliph Al-Mu'tasim dies at Samarra (modern Iraq) after a 8-year reign. He is succeeded by his son Al-Wathiq as ruler of the Abbasid Caliphate.
- March 20 – Alfonso II, king of Asturias (b. 759)
- January 5 – Al-Mu'tasim, Muslim caliph (b. 796)
- Bernard of Vienne, Frankish bishop (b. 778)
- Dúngal mac Fergaile, king of Osraige (Ireland)
- March 9 – Humbert, bishop of Würzburg
- Liu Yuxi, Chinese poet and philosopher (b. 772)
- August 24 – Saga, emperor of Japan (b. 786)
- Sugawara no Kiyotomo, Japanese nobleman (b. 770)
- January 20 – Theophilos, Byzantine emperor (b. 813)
- Uurad, king of the Picts (approximate date)
- John Skylitzes, A Synopsis of Byzantine History, 811—1057: Translation and Notes, transl. John Wortley, 81note114.
- Pierre Riche, The Carolingians: The Family who forged Europe, transl. Michael Idomir Allen, (University of Pennsylvania Press, 1983), p. 162.