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This article is about the year 921. For the number, see 921 (number).
|Centuries:||9th century – 10th century – 11th century|
|Decades:||890s 900s 910s – 920s – 930s 940s 950s|
|Years:||918 919 920 – 921 – 922 923 924|
|921 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1674|
|Bahá'í calendar||−923 – −922|
|English Regnal year||N/A|
|Chinese calendar||庚辰年 (Metal Dragon)
3617 or 3557
— to —
辛巳年 (Metal Snake)
3618 or 3558
|- Vikram Samvat||977–978|
|- Shaka Samvat||843–844|
|- Kali Yuga||4022–4023|
|Igbo calendar||−79 – −78|
|Japanese calendar||Engi 21
|Minguo calendar||991 before ROC
|Thai solar calendar||1464|
|Wikimedia Commons has media related to 921.|
- Crushing defeat of the Idrisid dynasty against their Fatimid rivals. The Fatimids take Tlemcen and Fès.
- The Fatimids create a new capital in Ifriqiya, Mahdiya.
- June 21 – Ahmad ibn Fadlan is sent from Baghdad to Almış, first Muslim elteber (client ruler) of Volga Bulgaria, on behalf of the Abbasid Caliph al-Muqtadir.
- The Later Liang dynasty of China reports that all "barbarian" tribes have been pacified by the Khitan.
- Treaty of Bonn East France and West France recognize each other.
- Ludmila of Bohemia is murdered at the command of her daughter-in-law at Tetin.
- Henry the Fowler invades Bavaria and obtains fealty from Arnulf the Bad.
- A Hungarian army led by Dursac (Tarhos?) and Bogát defeat at Brescia the army of insurgents, who plans to overthrow their ally, italian emperor, Berengar of Friuli.
- September 18 – Emperor Shizong of Later Zhou
- Edmund I of England (d. 946)
- Abe no Seimei, Japanese cosmologist (d. 1005)
- Ōnakatomi no Yoshinobu, Heian period waka poet and Japanese nobleman
- Shaykh Syed Mir Mirak Andrabi, fifth generation of Sadaat-Andrabia in the Kashmir Valley
- September 1 – Richard, Duke of Burgundy (b. c. 867)
- September 15 – Saint Ludmila, ruler of Bohemia
- Vratislaus I of Bohemia (b. c. 915)
- Ragnall ua Ímair, Norse-Gael king of Northumbria
- Gilbert Meynier (2010) L'Algérie cœur du Maghreb classique. De l'ouverture islamo-arabe au repli (658-1518). Paris: La Découverte; pp.28.
- Gilbert Meynier (2010) L'Algérie cœur du Maghreb classique. De l'ouverture islamo-arabe au repli (658-1518). Paris: La Découverte; pp.38.