920

920 in various calendars
Gregorian calendar	920; CMXX
Ab urbe condita	1673
Armenian calendar	369; ԹՎ ՅԿԹ
Assyrian calendar	5670
Balinese saka calendar	841–842
Bengali calendar	327
Berber calendar	1870
Buddhist calendar	1464
Burmese calendar	282
Byzantine calendar	6428–6429
Chinese calendar	己卯年 (Earth Rabbit); 3617 or 3410; — to —; 庚辰年 (Metal Dragon); 3618 or 3411
Coptic calendar	636–637
Discordian calendar	2086
Ethiopian calendar	912–913
Hebrew calendar	4680–4681
Hindu calendars
- Vikram Samvat	976–977
- Shaka Samvat	841–842
- Kali Yuga	4020–4021
Holocene calendar	10920
Iranian calendar	298–299
Islamic calendar	307–308
Japanese calendar	Engi 20; (延喜２０年)
Javanese calendar	819–820
Julian calendar	920; CMXX
Korean calendar	3253
Minguo calendar	992 before ROC; 民前992年
Nanakshahi calendar	−548
Seleucid era	1231/1232 AG
Thai solar calendar	1462–1463
Tibetan calendar	阴土兔年; (female Earth-Rabbit); 1046 or 665 or −107; — to —; 阳金龙年; (male Iron-Dragon); 1047 or 666 or −106

Millennium:	1st millennium
Centuries:	9th century; 10th century ; 11th century;
Decades:	900s; 910s; 920s ; 930s; 940s;
Years:	917; 918; 919; 920 ; 921; 922; 923;

Year 920 (CMXX) was a leap year starting on Saturday (link will display the full calendar) of the Julian calendar.

Events

December 17 – Romanos I has himself crowned co-emperor of the Byzantine Empire. He shares the throne with the 15-year-old Constantine VII (his son-in-law), and constructs an alternative palace at Constantinople with an adjoining monastery near the Great Palace. Though Constantine retains his formal position as first on the protocol list, Romanos becomes sole ruler.^[1]

The nobles of Lotharingia under Gilbert, duke of Lorraine, revolt against King Charles III ("the Simple"). They recognize King Henry I ("the Fowler") as their sovereign. Charles invades Lotharingia as far as Pfeddersheim (near Worms), but retreats when he learns that Henry is mobilizing an army to attack the West Frankish Kingdom.^[2]
Henry I conquers Utrecht (modern-day Netherlands), which has been in possession of the Vikings for 70 years. Balderic, bishop of Utrecht, moves his seat back from Deventer to Utrecht (approximate date).

High-Reeve Ealdred I, ruler of the former kingdom of Bernicia (Northumbria), and his brother Uhtred, submit to the overlordship of King Edward the Elder (approximate date).
The Welsh ruler Hywel Dda ("the Good") merges Dyfed and Seisyllwg, establishing a new kingdom known as Deheubarth.

July 26 — At the Battle of Valdejunquera, the Muslim forces of the Emir Abd-ar-Rahman III of Córdoba, defeat the Christian armies of King Ordoño II of León and King Sancho I of Pamplona. The decisive battle at the Val de Junquera takes place following the Emir's pre-emptive strike and his invasion of the upper Douro valley and the capture of Osma. The Arab army proceeds on to the upper Ebro, restoring and replenishing Umayyad garrisons in the region.^[3]

Emperor Taizu of the Khitan Empire orders the adoption of a written script by the Khitan, resulting in the creation of Khitan "Large Script."

^ 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.