921

By place

Byzantine Empire

• March - Battle of Pegae: Bulgarian forces under kavhan Theodore Sigritsa defeat the Byzantine army at the outskirts of Constantinople. After the battle, the Bulgarians burn the palaces in Pegae, and devastate the area north of the Golden Horn.

Europe

• Summer - King Henry I defeats his rival Arnulf I, duke of Bavaria, in two campaigns. Arnulf is besieged at Regensburg and forced to accept peace negotiations, recognising Henry as sole sovereign of the East Frankish Kingdom.
• Landulf I, prince of Benevento, supports an anti-Greek Apulian rebellion, ravaging several Byzantine strongpoints as far as Ascoli. The Apulian nobility, professing loyalty to the Byzantine Empire, appoints Landulf as stratego of the Theme of Longobardia.
• September 15 - Ludmila, Bohemian duchess and widow of Bořivoj I, is murdered by her daughter-in-law Drahomíra at Tetín. Ludmila will be canonised and become the patron saint of Bohemia and is venerated in the Orthodox and the Catholic Churches.
• November 7 - Treaty of Bonn: King Charles III and Henry I sign a peace treaty or 'pact of friendship' at a ceremony aboard a ship in the middle of the Rhine, recognising the border between their two Frankish kingdoms.
• A Hungarian mercenary force led by Dursac and Bogát defeats an army of insurgents, who plans to overthrow their ally, Emperor Berengar I, at Brescia.

Arabian Empire

• June 21 - A diplomatic delegation is sent from Baghdad to establish trade routes between the Abbasid Caliphate towards Bukhara. Ahmad ibn Fadlan, an Arab diplomat and traveller, makes contact with Almış, the İltäbär of Volga Bulgaria, on behalf of Caliph al-Muqtadir.
• Battle of Sevan: Sajid forces under Yusuf Beshir invade Armenia and besiege King Ashot II near Lake Sevan. After gathering a small force he attacks Beshir's camps and drives the enemy out of the country. Ashot starts a counter-offensive to rebuild the ruined cities and fortresses.

Africa

• The Fatimid Caliphate crushes Idrisid forces in battle, capturing the cities of Tlemcen and Fez.
• The Fatimid Caliphate creates a new capital in Ifriqiya, al-Mahdiya on the Tunisian coast.

China

• The Later Liang Dynasty reports that all "barbarian" tribes have been pacified by the Khitan Empire.