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874 in various calendars
Gregorian calendar	874; DCCCLXXIV
Ab urbe condita	1627
Armenian calendar	323; ԹՎ ՅԻԳ
Assyrian calendar	5624
Balinese saka calendar	795–796
Bengali calendar	280–281
Berber calendar	1824
Buddhist calendar	1418
Burmese calendar	236
Byzantine calendar	6382–6383
Chinese calendar	癸巳年 (Water Snake); 3571 or 3364; — to —; 甲午年 (Wood Horse); 3572 or 3365
Coptic calendar	590–591
Discordian calendar	2040
Ethiopian calendar	866–867
Hebrew calendar	4634–4635
Hindu calendars
- Vikram Samvat	930–931
- Shaka Samvat	795–796
- Kali Yuga	3974–3975
Holocene calendar	10874
Iranian calendar	252–253
Islamic calendar	260–261
Japanese calendar	Jōgan 16; (貞観１６年)
Javanese calendar	772–773
Julian calendar	874; DCCCLXXIV
Korean calendar	3207
Minguo calendar	1038 before ROC; 民前1038年
Nanakshahi calendar	−594
Seleucid era	1185/1186 AG
Thai solar calendar	1416–1417
Tibetan calendar	阴水蛇年; (female Water-Snake); 1000 or 619 or −153; — to —; 阳木马年; (male Wood-Horse); 1001 or 620 or −152

Millennium:	1st millennium
Centuries:	8th century; 9th century ; 10th century;
Decades:	850s; 860s; 870s ; 880s; 890s;
Years:	871; 872; 873; 874 ; 875; 876; 877;

Events

Salomon, duke ('king') of Brittany, is murdered by a faction which includes his son-in-law Pascweten and Gurvand, son-in-law of late ruler Erispoe. After Salomon's death they divide the country, and Pascweten and Gurvand co-rule Brittany.^[1]
Svatopluk I, ruler (knyaz) of Great Moravia, concludes a peace treaty at Forchheim (Northern Bavaria). He is able to expand his territories outside the Frankish sphere, and subjugates the Vistulans.^[2]^[3]
Ingólfr Arnarson arrives from Norway, as the first permanent Viking settler in Iceland. He builds his homestead and founds Reykjavík. The settlement of Iceland begins (approximate date).

The Danish Vikings (from their base at Repton) drive King Burgred of Mercia into exile, and sack Tamworth. They conquer his kingdom and install his political opponent, Ceolwulf II, as sub-king.^[4]
Autumn – The Great Heathen Army splits into two bands; Halfdan returns with his forces to Northumbria, along with his brother Ubba, where he establishes a new base on the River Tyne.^[5]
Amlaíb Conung, the first Norse 'king' of Dublin, is killed in Scotland, during a campaign against his rival Constantin I (approximate date).
November – Frost begins in Scotland, and lasts until April 875.^[6]

Huang Chao, a salt privateer, joins forces with Wang Xianzhi to raise a rebel army at Changyuan (modern Xinxiang). The uprising further weakens the Tang dynasty, which is already weakened by natural disasters such as severe droughts and floods.

March 13 – The remains of Saint Nikephorus I are interred in the Church of the Holy Apostles, in Constantinople.
The monastery of Sevanavank, located on the shore of Lake Sevan (Armenia), is founded.
Muhammad al-Mahdi, the child of the eleventh Shi'i Twelver Imam Hasan al-Askari, begins his Imamate. His first period of occultation, known as the Minor Occultation, also begins (ends 941 CE).

^ Smith, p. 121.
^ Bartl 2002, p. 21.
^ Kirschbaum 2007, p. 121.
^ Chisholm, Hugh, ed. (1911). "Burgred" . Encyclopædia Britannica (11th ed.). Cambridge University Press. p. 820.
^ Paul Hill (2009). The Viking Wars of Alfred the Great, p. 61. ISBN 978-1-59416-087-5.
^ Stratton, J. M. (1969). Agricultural Records. John Baker. ISBN 0-212-97022-4.