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Events

Spring - Viking raiders ravage Flanders, and sack the abbey at Saint-Quentin. King Carloman II blocks their passage at Laviers, which had been on the banks of the Somme. Meanwhile, Vikings enter the Rhine, but are turned back by Henry of Franconia. They over-winter at Duisburg.
King Charles the Fat travels to Nonantola, where he meets Pope Marinus I. He receives complaints of Guy II of Spoleto, who is the official "protector" of Rome, and invades the Papal States. King Charles orders Guy to appear before a tribunal.
Guy II of Spoleto begins a revolt, and assembles an army supported with Arab auxiliaries. King Charles the Fat sends Berengar of Friuli with an expeditionary force to deprive him of Spoleto. An epidemic ravages Berengar's army, and forces them to retire.
Svatopluk I, ruler of Great Moravia, conquers Lower Pannonia, during the succession strife in the East Frankish Kingdom.
The first historic document mentions Duisburg.

The Zanj Rebellion: Abbasid general Al-Muwaffaq brings in Egyptian forces, to help him in his two-year siege of the Zanj capital Mukhtara. He captures the city, and crushes the revolt that has devastated Chaldea since 869.
September 11 - Yazaman al-Khadim, Abbasid governor of Tarsus, routs a Byzantine army under general Kesta Styppiotes, in a night attack. According to Arab chroniclers, 70,000 out of 100,000 Byzantine troops are killed.