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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 (Northern France), and submit to King Charles the Bald. He and his family accept Christianity (they are baptised) before leaving Neustria.
Robert the Strong, margrave of Neustria, captures 12 Viking ships and kills their crews. He pays tribute (Danegeld) for keeping the Vikings out of Neustria.<ref>John Haywood (1995). Historical Atlas of the Vikings, p. 61. Penguin Books: Template:ISBN.</ref>
Carloman, eldest son of King Louis the German, revolts against his father. He is captured, but manages to escape to the Ostmark (or 861).
First raid of the Hungarians in the Carpathian Basin at the request of Rastislav of Moravia against the East Frankish Kingdom.<ref>Bóna, István (2000). The Hungarians and Europe in the 9th-10th centuries. Budapest: Historia - MTA Történettudományi Intézete, p. 13. Template:ISBN.</ref>
Viking forces sack Cologne.

April 13 – King Donald I of Scotland dies after a 4-year reign. He is succeeded by his nephew Constantine I, as ruler of Scotland.
Áed Findliath is crowned High King of Ireland, after the death of Máel Sechnaill mac Maíl Ruanaid (until 879).

The Varangians (called Rus'), under the leadership of Rurik, a Viking chieftain, arrive (with his brothers, Sineus and Truvor) at Staraya Ladoga. He builds a trade settlement near Novgorod (modern Russia), and founds the Rurik Dynasty.
The first written record (according to the Primary Chronicle) is made of the towns of Belozersk and Murom (Northern Russia).

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

Fan Chuo finishes his Manchu ("Book of the Southern Tribes"), during the Tang Dynasty.

Constantine the Philosopher (alias Saint Cyril) invents the 42-letter Slavonic alphabet (Cyrillic script) as a tool for converting the Moravians to Christianity (approximate date).

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.<ref>Template:Cite journal</ref>