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Events

April 10 - King Louis the Stammerer dies at Compiègne, after a reign of 18 months. He is succeeded by his two sons, Louis III and Carloman II. They are crowned at Ferrières Abbey, and rule the West Frankish Kingdom together as joint-kings.
Baldwin I dies, after 15 years as margrave of Flanders. He is buried in the Abbey of Saint Bertin, and is succeeded by his son Baldwin II.
Oleg, brother-in-law of the Varangian ruler Rurik, is entrusted to take care of his kingdom Novgorod after his death. He becomes regent of his son Igor.
King Charles the Fat becomes ruler of the Kingdom of Italy, after the abdication of his brother Carloman of Bavaria, who has been incapacitated by a stroke.

King Alfred the Great establishes a series of fortified villages to protect Wessex against Viking raids. He creates a standing army to defend the strategic ports, and builds a network of well-maintained army roads.
Viking leader Guthrum becomes 'king' of East Anglia. A Viking fleet sails up the River Thames, and builds a camp at Fulham to prepare for an invasion of France.

Zanj Rebellion: The Abbasid Caliphate concentrates its efforts against the Zanj rebels in Mesopotamia. The Abbasid general Al-Mu'tadid leads an expeditionary force to suppress the revolt. This marks the turning-point of the war.

Guangzhou Massacre: The Chinese rebel leader Huang Chao besieges the seaport in Guangzhou, and slaughters many of its inhabitants and foreign merchants. According to sources, the death toll ranges from 120,000 to 200,000 foreigners.