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913 ( ) was a CMXIII common year starting on Friday (link will display the full calendar) of the Julian calendar.
June 6 – Emperor Alexander III dies of exhaustion while playing the game ( tzykanion Byzantine name for polo). He is succeeded by his 8-year-old nephew Constantine VII (" Porphyrogennetos born in the purple"), a son of the late emperor Leo VI ( the Wise). The government is administered by a regency council composed of Constantine's mother, Empress Zoe Karbonopsina, Patriarch Nicholas Mystikos and his guardian John Eladas. August –
Byzantine–Bulgarian War: Simeon I ( the Great), ruler ( ) of the knyaz Bulgarian Empire, launches a campaign at the head of a large Bulgarian army, and reaches Constantinople unopposed. The Bulgarians besiege the Byzantine capital and construct ditches from the Golden Horn to the Golden Gate at the Marmara Sea.  After negotiations the  siege is lifted and Simeon is recognised as emperor of the Bulgarians. Summer – Constantine Doukas, a Byzantine general ( ), tries, unsuccessfully, with the support of several magister militum aristocrats to usurp the throne from the young Constantine VII. He is killed in a clash by the soldiers of the guard, assembled by John Eladas. His head is cut off and presented to Constantine. Hetaireia
Caliph Abdullah al-Mahdi Billah of the Fatimid Caliphate replaces the unpopular governor Ibn Abi Khinzir with Ali ibn Umar al-Balawi. But the Sicilian lords find this unacceptable and decide to declare independence of Sicily. They acknowledge allegiance to the Abbasid caliph Al-Muqtadir and acclaim an Aghlabid prince, Ahmed ibn Khorob, as emir of Sicily. The Sicilians re-launch their conquest of Byzantine Calabria, while Ahmed ibn Khorob in Sicily leads a successful assault against the North African cities of Sfax and Tripoli. 
May 15 – Hatto I, archbishop of Mainz
June 6 – Alexander III, Byzantine emperor (b. 870) June/July –
Abu Sa'id al-Jannabi, founder of the Qarmatian state in Bahrayn (assassinated)  
August 21 – Tang Daoxi, Chinese general
Anastasius III, pope of the Catholic Church
Cheng Ji, Chinese general and strategist
Constantine Doukas, Byzantine general
Eadwulf II, ruler (high- reeve) of Northumbria
Li Yantu, ruler of Qian Prefecture
Torpaid mac Taicthech, Irish poet
Ubaydallah ibn Abdallah, Tahirid governor
Wang Yuanying, Chinese prince (b. 892) Zhu Yougui, emperor of Later Liang
Angelov et al 1981, p. 285.
Zlatarski 1972, p. 358.
^ Bóna, István (2000).
The Hungarians and Europa in the 9th-10th centuries. Budapest: Historia - MTA Történettudományi Intézete, pp. 13–14. ISBN 963-8312-67-X.
Bresc, Henri (2003). "La Sicile et l'espace libyen au Moyen Age" (PDF) . Retrieved . January 17, 2012
Carra de Vaux, B.; Hodgson, M. G. S. (1965). . In "al-D̲j̲annābī" Lewis, B.; Pellat, Ch.; Schacht, J. (eds.). The Encyclopaedia of Islam, New Edition, Volume II: C–G. Leiden: E. J. Brill. p. 452.
Madelung, Wilferd (1983). "ABŪ SAʿĪD JANNĀBĪ". Encyclopædia Iranica, Vol. I, Fasc. 4. pp. 380–381.