Pope John XII crowns Otto I emperor in Rome, commonly regarded as the beginning of the Holy Roman Empire.
Date given in the Julian calendar.
King Otto I of Germany defeats the Magyars near Augsburg, ending Hungarian raids into Western Europe.
Hugh Capet is elected King of the Franks, founding the Capetian dynasty whose branches ruled France for centuries.
Grand Prince Vladimir I of Kiev is baptized and makes Byzantine Orthodox Christianity the religion of the Rus'.
The Althing decides that Iceland will officially adopt Christianity while tolerating some private pagan practice.
Stephen I becomes the first Christian king of Hungary, marking the establishment of the Kingdom of Hungary.
Cluny Abbey is founded in Burgundy and becomes the centre of a monastic reform movement influential across Europe.