851

Millennium:	1st millennium
Centuries:	8th century – 9th century – 10th century
Decades:	820s 830s 840s – 850s – 860s 870s 880s
Years:	848 849 850 – 851 – 852 853 854

851 by topic
Politics
State leaders – Sovereign states
Birth and death categories
Births – Deaths
Establishment and disestablishment categories
Establishments – Disestablishments

851 in other calendars
Gregorian calendar	851 DCCCLI
Ab urbe condita	1604
Armenian calendar	300 ԹՎ Յ
Assyrian calendar	5601
Bengali calendar	258
Berber calendar	1801
Buddhist calendar	1395
Burmese calendar	213
Byzantine calendar	6359–6360
Chinese calendar	庚午年 (Metal Horse) 3547 or 3487 — to — 辛未年 (Metal Goat) 3548 or 3488
Coptic calendar	567–568
Discordian calendar	2017
Ethiopian calendar	843–844
Hebrew calendar	4611–4612
Hindu calendars
- Vikram Samvat	907–908
- Shaka Samvat	773–774
- Kali Yuga	3952–3953
Holocene calendar	10851
Iranian calendar	229–230
Islamic calendar	236–237
Japanese calendar	Kashō 4 / Ninju 1 (仁寿元年)
Julian calendar	851 DCCCLI
Korean calendar	3184
Minguo calendar	1061 before ROC 民前1061年
Seleucid era	1162/1163 AG
Thai solar calendar	1393–1394

Wikimedia Commons has media related to 851.

Year 851 (DCCCLI) was a common year starting on Thursday (link will display the full calendar) of the Julian calendar.

Events

Vikings plunder London and Canterbury.
Charles the Bald, Louis the German and Lothar meet in Meersen.
Garcia Iñiguez succeeds his father Iñigo Arista as king of Navarra.
August 22 – Battle of Jengland. Erispoe, king of Brittany and son of Nominoe, defeats the Franc king Charles the Bald in Jengland-Beslé near Grand-Fougeray in Brittany. This is considered as the birth of the Breton state.
September – Treaty of Angers. Charles the Bald acknowledges Erispoë as king of Brittany. He lets him have the County of Nantes, the County of Rennes and the County of Retz which become part of the Breton nation. The King of Brittany takes the oath to the King of France (but not an hommage lige which would be an allegiance). To mark the sovereignty of the Breton state, the Dukes of Brittany are since then crowned as "Duke, king in their lands".^[1]

Oldest known mention of the Andaman Islands.
Bagrat II Bagratuni, "Prince of Princes" of Arminiya, is captured by the Abbasid Caliphate and taken to Samarra.
The Arab merchant Suleiman al-Tajir visits Tang Dynasty China, observing the manufacturing of Chinese porcelain at Guangzhou and writes of his admiration for its transparent quality. He also describes the mosque at Guangzhou, its granaries, its local government administration, some of its written records, and the treatment of travellers, along with the use of ceramics, rice-wine, and tea.