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Events

King Lothair II of Lotharingia tries to divorce his wife Teutberga, on trumped-up charges of incest. With the support of his brother, Louis II, the bishops give him permission to remarry during a synod at Aachen.
March - Viking raiders led by Weland are trapped at Trilbardou Bridge, and submit to King Charles the Bald. He and his family accept Christianity before leaving Neustria.
Robert the Strong, margrave of Neustria, captures 12 Viking ships and kills their crews. He pays tribute for keeping the Vikings out of Neustria.
Carloman, eldest son of King Louis the German, revolts against his father. He is captured, but manages to escape to the Ostmark.
First raid of the Hungarians in the Carpathian Basin at the request of Rastislav of Moravia against the East Frankish Kingdom.
Viking forces sack Cologne.

The Varangians, under the leadership of Rurik, a Viking chieftain, arrive at Staraya Ladoga. He builds a trade settlement near Novgorod, and founds the Rurik Dynasty.
The first written record is made of the towns of Belozersk and Murom.

June - Caliph al-Muntasir dies after just a half-year reign. He is succeeded by al-Musta'in, as ruler of the Abbasid Caliphate.
Ashot I is recognized as the 'Prince of Princes' of Armenia, by the Abbasids.

During the Council of Shirakavan representatives of the Armenian, Byzantine and West-Syrian Churches convenes to discuss church union. Though this is not achieved, an agreement is formulated which allows for the peaceful co-existence of Orthodox and non-Chalcedonians in the Byzantine-Armenian borderlands.