870

870 in other calendars
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	己丑年 (Earth Ox); 3566 or 3506; — to —; 庚寅年 (Metal Tiger); 3567 or 3507
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	Jōgan 12; (貞観１２年)
Javanese calendar	767–768
Julian calendar	870; DCCCLXX
Korean calendar	3203
Minguo calendar	1042 before ROC; 民前1042年
Nanakshahi calendar	−598
Seleucid era	1181/1182 AG
Thai solar calendar	1412–1413
Tibetan calendar	阴土牛年; (female Earth-Ox); 996 or 615 or −157; — to —; 阳金虎年; (male Iron-Tiger); 997 or 616 or −156

Millennium:	1st millennium
Centuries:	8th century – 9th century – 10th century
Decades:	840s 850s 860s – 870s – 880s 890s 900s
Years:	867 868 869 – 870 – 871 872 873

870 (DCCCLXX) was a common year starting on Sunday of the Julian calendar, the 870th year of the Common Era (CE) and Anno Domini (AD) designations, the 870th year of the 1st millennium, the 70th year of the 9th century, and the 1st year of the 870s decade. As of the start of 870, the Gregorian calendar was 4 days ahead of the Julian calendar, which was the dominant calendar of the time.

Events

Prague Castle is founded.
The Great Summer Army invades England. It is led by Bagsecg. They conquers East Anglia.
August 8 – Treaty of Meerssen: Charles the Bald and Louis the German divide Lotharingia among themselves.
December 31 – The Danes are defeated by a Saxon army at Englefield, Berkshire. It is the first of a series of battles between Wessex and the Danes.
Malta is conquered by Arabs from Sicily.
Borivoj becomes duke of Bohemia.
Charles the Bald marries Richilde.