|Covid-19|Emperor Charlemagne formally cedes Nordalbian territory (modern-day Schleswig-Holstein) to the pagan Obotrites (allies of the Carolingian Empire).
April 3 – King Louis the Pious, son of Charlemagne, captures Barcelona after a siege of several months. Bera is appointed first count of Barcelona.
King Eardwulf of Northumbria leads an army into Mercia against his rival, Coenwulf, in order to flush out other claimants to the Northumbrian throne.
Rabanus Maurus, Frankish Benedictine monk, takes his vows in the monastery of Fulda and receives ordination as a deacon.
Al-Kindi, Muslim philosopher and polymath (approximate date)
September 8 – Ansgar, Frankish monk and archbishop (d. 865)
June 17 – Drogo of Metz, illegitimate son of Charlemagne
Waldrada of Worms, Frankish noblewomen and wife of Conrad II
Wang Chengyuan, general of the Tang Dynasty (d. 834)
Heathoberht, Bishop of London
Rabia Basri, Muslim Sufi mystic and saint (b. 717)
Year 801 (DCCCI) was a common year starting on Friday (link will display the full calendar) of the Julian calendar.