Events

By place

Europe

• Ethelred succeeds as king of Wessex (or 866).

• Louis the German divides his kingdom among his sons.

• Lothair, threatened with excommunication, takes back his first wife, Theutberga.

• Bulgaria under Boris I converts to Orthodox Christianity.

Asia

• A Russian expedition for the first time threatens Constantinople.

Births

• Hersent, Duchess of Lorraine, France

• Abū Bakr Muhammad ibn Zakarīya al-Rāzi, physician, philosopher, and scholar who discovererd alcohol

Deaths

• Saint Ansgar (b. 801)

• Ragnar Lodbrok, King of Denmark and Sweden

• Liu Gongquan