870

870 in variouscalendars
Gregorian calendar	870; DCCCLXX
Ab urbe condita	1623
Armenian calendar	319; ԹՎ ՅԺԹ
Assyrian calendar	5620
Balinese saka calendar	791–792
Bengali calendar	277
Berber calendar	1820
Buddhist calendar	1414
Burmese calendar	232
Byzantine calendar	6378–6379
Chinese calendar	Mình xấuNăm (EarthOx); 3567 or 3360; — to —; Canh dần năm (MetalTiger); 3568 or 3361
Coptic calendar	586–587
Discordian calendar	2036
Ethiopian calendar	862–863
Hebrew calendar	4630–4631
Hindu calendars
-Vikram Samvat	926–927
-Shaka Samvat	791–792
-Kali Yuga	3970–3971
Holocene calendar	10870
Iranian calendar	248–249
Islamic calendar	256–257
Japanese calendar	Jōgan12; ( trinh quan １２ năm )
Javanese calendar	767–768
Julian calendar	870; DCCCLXX
Korean calendar	3203
Minguo calendar	1042 beforeROC; Dân trước 1042 năm
Nanakshahi calendar	−598
Seleucid era	1181/1182AG
Thai solar calendar	1412–1413
Tibetan calendar	Âm trâu đất năm; (female Earth-Ox); 996 or 615 or −157; — to —; Dương kim hổ năm; (male Iron-Tiger); 997 or 616 or −156

Millennium:	1st millennium
Centuries:	8th century; 9th century; 10th century;
Decades:	850s; 860s; 870s; 880s; 890s;
Years:	867; 868; 869; 870; 871; 872; 873;

Year870(DCCCLXX) was acommon year starting on Sunday(link will display the full calendar) of theJulian calendar,the 870th year of theCommon Era(CE) andAnno Domini(AD) designations, the 870th year of the1st millennium,the 70th year of the9th century,and the 1st year of the870sdecade.

Events

August 8–Treaty of Meerssen:KingLouis the Germanforces his half-brotherCharles the Baldto accept apeace treaty,which partitions theMiddle Frankish Kingdominto two larger east and west divisions. Louis receives most ofAustrasia(which evolves into theKingdom of Germany), and Charles receives territory inLower Burgundy(which evolves into theKingdom of France). However, large parts of theFrisiancoast are underVikingcontrol.
Charles the Bald marriesRichilde of Provence,after the death of his first wife,Ermentrude of Orleans.He intends to secure his rule inLotharingiathrough the powerfulBosonidfamily and the connection toTeutberga,widow-queen ofLothair II.^[1]
Rastislav,ruler (knyaz) ofGreat Moravia,dies in prison after he is condemned to death fortreason,by Louis the German. He is succeeded by his nephewSvatopluk I,who becomes avassalof theEast Frankish Kingdom.
Bořivoj I,duke ofBohemia,makesLevý Hradec(modernCzech Republic) his residence. Around this timePrague Castleis founded (approximate date).
Wilfred the Hairy,a Frankishnobleman,becomes count ofUrgellandCerdanya(modern-dayCatalonia).

Autumn – TheGreat Heathen Army,led byIvar the BonelessandUbba,invadesEast Angliaand plundersPeterborough.KingEdmund the Martyris captured,tortured,beaten and used forarcherypractice (or869).
TheDanes,led by Ivar the Boneless and King Olaf of theDublinVikings, besiegeDumbartoninScotland,the capital of KingArtgal of Stratchlyde.After asiegeof four months, thecitadelis captured and destroyed.^[2]
The Danes, led byHalfdan RagnarssonandBagsecg,invadeWessexand take the royal estate atReading(Berkshire), which Halfdan makes his headquarters. A naval Viking contingent sails up theThames River.^[3]
December 31–Battle of Englefield:The Vikings clash with ealdormanÆthelwulf of Berkshire.The invaders are driven back to Reading; many of the Danes (including one of the earls named Sidrac) are killed.

January 29–Anarchy at Samarra:The rebelSalih ibn Wasifis hunted down and killed inAbbasid Samarraby troops ofMusa ibn Bugha al-Kabir.
June 21– CaliphAl-Muhtadiis deposed and killed by theTurks,after a brief reign. He is succeeded byAl-Mu'tamid(son of the lateAl-Mutawakkil) as ruler of theAbbasid Caliphate,who moves hiscourttoBaghdad.End of theAnarchy at Samarra.
Byzantine–Arab War:AMuslimexpeditionary force, led by Halaf al-Hadim, Arab governor ofSicily,conquersMalta.He is welcomed by the local Christian inhabitants as liberator of the agonizingByzantineyoke. The Muslims sign a treaty with the Christians to live in peace after liberating the island from the Byzantines.
TheZanj Rebellion:TheZanj(blackslavesfromEast Africa) capture the Abbasid seaport ofAl-Ubdullahat thePersian Gulf,and cut off communications withBasra(modernIraq).

February 28– TheFourth Council of Constantinopleends. TheBulgariansare granted an autocephalousarchbishopric.with its seat in the capital ofPliska.

^Monumenta Germanica Historica, tomus I: Annales Lobienses, anno 855,p. 232.
^MacQuarrie (2013), pp. 12–13.
^Paul Hill (2009).The Viking Wars of Alfred the Great,p. 37.ISBN 978-1-59416-087-5.
^Hartley, Cathy (2003).A Historical Dictionary of British Women.Psychology Press. p. 7.ISBN 9781857432282.