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

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.
22 August: 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 tne 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.
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.