Year 911 (CMXI) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar.
A rebellion of the Kutama Berbers against the Fatimid Caliphate occurs. The Kutama tribesmen have previously been the main supporters of the new Shi'ite regime.
July 11 – Charles the Simple, King of France, and Rollo, leader of the Vikings, sign the Treaty of Saint-Clair-sur-Epte, allowing the Vikings to settle in Neustria, in exchange for agreeing to defend Charles from his northern enemies.
September – Following the death of Louis the Child, last Carolingian ruler of the East Franks, Charles (the Simple) of France is elected King of Lotharingia.
The Fatimids begin the conquest of Sicily, over their Aghlabid archrivals.
April – Pope Anastasius III succeeds Pope Sergius III, as the 120th pope.
Minamoto no Shitagō, Japanese poet
April 4 – Liu Yin, Tang Dynasty leader
April 14 – Pope Sergius III, pope of the Roman Catholic Church
September – Louis the Child, last Carolingian ruler of the East Franks
Æthelred, Ealdorman of Mercia, husband of Æthelflæd
Tecpancaltzin Iztaccaltzin, tlatoani of the Toltec Empire
Wifred II, Count of Barcelona
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