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Year 920 (CMXX) was a leap year starting on Saturday (link will display the full calendar) of the Julian calendar.
- Summer – Abd al-Rahman III, emir of Córdoba, launches a pre-emptive strike against the Kingdom of León. He personally leads an Arab army and invades the territory in the upper Duero valley, taking Osma, before defeating the hastily gathered forces of King Ordoño II and his ally Sancho I. Two Leonese bishops are captured in the rout. The Arab army proceed on to the upper Ebro, restoring and replenishing Umayyad garrisons in the region.
- Emperor Taizu of the Khitan Empire orders the adoption of a written script by the Khitan, resulting in the creation of Khitan "Large Script."
- Adso of Montier-en-Der, Frankish Benedictine abbot (d. 992)
- Athanasius the Athonite, Byzantine monk (approximate date)
- Dunash ben Labrat, Spanish Jewish commentator (d. 990)
- Fujiwara no Morotada, Japanese statesman (d. 969)
- Gao Baorong, king of Nanping (Ten Kingdoms) (d. 960)
- Goltregoda, Frankish countess and regent (d. 963)
- Guntram the Rich, founder of the House of Habsburg (d. 973)
- Haakon I, king of Norway (approximate date)
- Hugh of Vermandois, Frankish archbishop (d. 962)
- Li Jingsui, prince of Southern Tang (d. 958)
- Liu Bin, emperor of Southern Han (d. 943)
- Liu Sheng, emperor of Southern Han (d. 958)
- Liutprand of Cremona, Lombard bishop (d. 972)
- Louis IV, king of the West Frankish Kingdom (or 921)
- Megingoz, count of Guelders (approximate date)
- Menahem ben Saruq, Spanish Jewish philologist (d. 970)
- Minamoto no Masanobu, Japanese nobleman (d. 993)
- Miró III, count of Cerdanya and Besalú (d. 984)
- Oliba Cabreta, Frankish nobleman (approximate date)
- Ratna Pala, king of Kamarupa (India) (d. 960)
- Reginar III, Frankish nobleman (approximate date)
- Rogvolod, prince of Polotsk (approximate date)
- Abd-Allah Mikali, Abbasid governor
- Abu Sa'id al-Janadi, Arab scholar
- Æthelweard, son of Alfred the Great (or 922)
- Ahmad ibn Sahl, Samanid governor
- Brahma Pala, king of Kamarupa
- Georgios I, ruler of Makuria (Egypt)
- Harumichi no Tsuraki, Japanese poet
- Mael Macduach, king of Hy Fiachrach (Ireland)
- Raymond I, count of Pallars and Ribagorza (Spain)
- Stephen of Liège, Frankish bishop
- Yang Longyan, king of Wu (b. 897)
- ^ Timothy Reuter (1999). The New Cambridge Medieval History: Volume III, p. 563. ISBN 978-0-521-36447-8.
- ^ Timothy Reuter (1999). The New Cambridge Medieval History: Volume III, p. 314. ISBN 978-0-521-36447-8.
- ^ Timothy Reuter (1999). The New Cambridge Medieval History: Volume III, p. 675. ISBN 978-0-521-36447-8.
- ^ Domínguez-Castro, Fernando; Vaquero, José Manuel; Marín, Manuela; Gallego, María Cruz; García-Herrera, Ricardo. "How useful could Arabic documentary sources be for reconstructing past climate?" Weather 67(3): 76-82 doi:10.1002/wea.835 march 2012.