|Ab urbe condita||1636|
|Balinese saka calendar||804–805|
|Chinese calendar||壬寅年 (Water Tiger)|
3579 or 3519
— to —
癸卯年 (Water Rabbit)
3580 or 3520
|- Vikram Samvat||939–940|
|- Shaka Samvat||804–805|
|- Kali Yuga||3983–3984|
|Japanese calendar||Gangyō 7|
|Minguo calendar||1029 before ROC|
|Seleucid era||1194/1195 AG|
|Thai solar calendar||1425–1426|
1009 or 628 or −144
— to —
1010 or 629 or −143
- Spring – Viking raiders ravage Flanders, and sack the abbey at Saint-Quentin. King Carloman II blocks their passage at Laviers, which had been on the banks of the Somme. Meanwhile, Vikings enter the Rhine, but are turned back by Henry of Franconia (possibly a margrave of Saxony). They over-winter at Duisburg.
- King Charles the Fat travels to Nonantola (Northern Italy), where he meets Pope Marinus I. He receives complaints of Guy II of Spoleto, who is the official "protector" of Rome, and invades the Papal States. King Charles orders Guy to appear before a tribunal.
- Guy II of Spoleto begins a revolt, and assembles an army supported with Arab auxiliaries. King Charles the Fat sends Berengar of Friuli with an expeditionary force to deprive him of Spoleto. An epidemic ravages Berengar's army, and forced them to retire.
- Svatopluk I, ruler (knyaz) of Great Moravia, conquers Lower Pannonia (modern Hungary), during the succession strife in the East Frankish Kingdom (approximate date).
- The first historic document (written by Regino of Prüm) mentions Duisburg.
- The Zanj Rebellion: Abbasid general Al-Muwaffaq brings in Egyptian forces, to help him in his two-year siege of the Zanj capital Mukhtara. He captures the city, and crushes the revolt that has devastated Chaldea (modern Iraq) since 869.
- September 11 – Yazaman al-Khadim, Abbasid governor of Tarsus, routs a Byzantine army under general Kesta Styppiotes, in a night attack. According to Arab chroniclers, 70,000 out of 100,000 Byzantine troops are killed.
- September 11 – Kesta Styppiotes, Byzantine general
- Ali ibn Umar, sultan of Morocco
- Ansegisus, archbishop of Sens (or 879)
- Anselm of Farfa, Frankish abbot (approximate date)
- Bertharius, Benedictine abbot and poet
- Bertulf, archbishop of Trier
- Dawud al-Zahiri, Muslim scholar (or 884)
- Eochocán mac Áedo, king of Ulaid (Ireland)
- Froila, Galician bishop
- Guy II, duke of Spoleto
- Han Jian, Chinese warlord
- Ignatius II, patriarch of Antioch
- Pi Rixiu, Chinese poet
- Wang Jingchong, Chinese governor (b. 847)
- Yang Fuguang, Chinese general (b. 842)
- Italian History - Timeline, p. 9.
- Fields, Philip M. (1987). The History of al-Ṭabarī, Vol. XXXVII: The ʻAbbāsid Recovery. Albany, New York: State University of New York Press. pp. 143–144. ISBN 0-88706-053-6.