en AD 911

911 in various calendars
Gregorian calendar	911; CMXI
Ab urbe condita	1664
Armenian calendar	360; ԹՎ ՅԿ
Assyrian calendar	5661
Balinese saka calendar	832–833
Bengali calendar	317–318
Berber calendar	1861
Buddhist calendar	1455
Burmese calendar	273
Byzantine calendar	6419–6420
Chinese calendar	庚午年 (Metal Horse); 3608 or 3401; — to —; 辛未年 (Metal Goat); 3609 or 3402
Coptic calendar	627–628
Discordian calendar	2077
Ethiopian calendar	903–904
Hebrew calendar	4671–4672
Hindu calendars
- Vikram Samvat	967–968
- Shaka Samvat	832–833
- Kali Yuga	4011–4012
Holocene calendar	10911
Iranian calendar	289–290
Islamic calendar	298–299
Japanese calendar	Engi 11; (延喜１１年)
Javanese calendar	810–811
Julian calendar	911; CMXI
Korean calendar	3244
Minguo calendar	1001 before ROC; 民前1001年
Nanakshahi calendar	−557
Seleucid era	1222/1223 AG
Thai solar calendar	1453–1454
Tibetan calendar	阳金马年; (male Iron-Horse); 1037 or 656 or −116; — to —; 阴金羊年; (female Iron-Goat); 1038 or 657 or −115

Millennium:	1st millennium
Centuries:	9th century; 10th century ; 11th century;
Decades:	890s; 900s; 910s ; 920s; 930s;
Years:	908; 909; 910; 911 ; 912; 913; 914;

911 (CMXI) was a common year starting on Tuesday of the Julian calendar.

Events

September 24 – King Louis IV (the Child), the last Carolingian ruler of the East Frankish Kingdom, dies at Frankfurt am Main after an 11-year reign. The East Frankish dukes elect Conrad I at Forchheim as the king of the East Frankish Kingdom. Charles III is elected as king of Lotharingia. Conrad is chosen through the influence of Louis' guardian and regent, Hatto I, archbishop of Mainz.
Autumn – King Charles III (the Simple) and Rollo, leader of the Vikings, sign a peace agreement (Treaty of Saint-Clair-sur-Epte). In return for his homage and conversion to Christianity, Rollo becomes a vassal and is made Count of Rouen; this is the beginning of the duchy of Normandy. He divides the lands between the rivers Epte and Risle among his chieftains, and prevents any other Vikings sailing up the Seine to attack the West Frankish Kingdom.^[1]
The Hungarians cross Bavaria, and invade Swabia and Franconia. They plunder the territories from Minfeld to Aargau. After that, they cross the Rhine, and attack Burgundy for the first time.
The Fatimids begin the conquest of Sicily, over their Aghlabid archrivals. Fatimid Sicilian governor Ibn al-Khinzir raids the south Italian coast (approximate date).

Lord Æthelred of Mercia dies. He is buried in St. Oswald's Priory at Gloucester and is succeeded by his wife, Princess Æthelflæd, as Lady of the Mercians. Her brother, King Edward the Elder, insists on taking control of London and Oxford.

A rebellion of the Kutama Berbers against the Fatimid Caliphate occurs. The Kutama tribesmen were previously the main supporters of the Shia regime.^[2]

April 14 – Pope Sergius III dies at Rome after a 7-year reign. He is succeeded by Anastasius III as the 120th pope of the Catholic Church.

^ John Haywood (1995). Historical Atlas of the Vikings, p. 80. Penguin Books: ISBN 978-0-140-51328-8.
^ Meynier, Gilbert (2010). L'Algérie, cœur du Maghreb classique: De l'ouverture islamo-arabe au repli (658–1518). Paris: La Découverte. p. 38.
^ Madelung, W. (2004). "al-Ḥādī Ila 'l-Ḥaḳḳ". In Bearman, P. J.; Bianquis, Th.; Bosworth, C. E.; van Donzel, E. & Heinrichs, W. P. (eds.). The Encyclopaedia of Islam, Second Edition. Volume XII: Supplement. Leiden: E. J. Brill. pp. 334–335. doi:10.1163/1573-3912_islam_SIM_8582. ISBN 978-90-04-13974-9.