| Millennium: | 1st millennium | 
|---|---|
| Centuries: | |
| Decades: | |
| Years: | 
| 850 by topic | 
|---|
| Leaders | 
| Categories | 
  | 
| Gregorian calendar | 850 DCCCL  | 
| Ab urbe condita | 1603 | 
| Armenian calendar | 299 ԹՎ ՄՂԹ  | 
| Assyrian calendar | 5600 | 
| Balinese saka calendar | 771–772 | 
| Bengali calendar | 257 | 
| Berber calendar | 1800 | 
| Buddhist calendar | 1394 | 
| Burmese calendar | 212 | 
| Byzantine calendar | 6358–6359 | 
| Chinese calendar | 己巳年 (Earth Snake) 3547 or 3340 — to — 庚午年 (Metal Horse) 3548 or 3341  | 
| Coptic calendar | 566–567 | 
| Discordian calendar | 2016 | 
| Ethiopian calendar | 842–843 | 
| Hebrew calendar | 4610–4611 | 
| Hindu calendars | |
| - Vikram Samvat | 906–907 | 
| - Shaka Samvat | 771–772 | 
| - Kali Yuga | 3950–3951 | 
| Holocene calendar | 10850 | 
| Iranian calendar | 228–229 | 
| Islamic calendar | 235–236 | 
| Japanese calendar | Kashō 3 (嘉祥3年)  | 
| Javanese calendar | 747–748 | 
| Julian calendar | 850 DCCCL  | 
| Korean calendar | 3183 | 
| Minguo calendar | 1062 before ROC 民前1062年  | 
| Nanakshahi calendar | −618 | 
| Seleucid era | 1161/1162 AG | 
| Thai solar calendar | 1392–1393 | 
| Tibetan calendar | 阴土蛇年 (female Earth-Snake) 976 or 595 or −177 — to — 阳金马年 (male Iron-Horse) 977 or 596 or −176  | 

Viking expansion with conquered areas
For codepage, see CP850. Year 850 (DCCCL) was a common year starting on Wednesday (link will display the full calendar) of the Julian calendar.
Events
By place
Europe
- February 1 – King Ramiro I dies in his palace at Santa María del Naranco (near Oviedo), after an 8-year reign. He is succeeded by his son Ordoño I, as ruler of Asturias.
 - Danish Viking raiders, led by King Rorik, conquer Dorestad and Utrecht (modern-day Netherlands). Emperor Lothair I recognizes him as ruler of most of Friesland.
 - King Louis II, the eldest son of Lothair I, is crowned joint emperor by Pope Leo IV at Rome, and becomes co-ruler of the Middle Frankish Kingdom.
 
Britain
- King Kenneth I (also called Kenneth MacAlpin) of Alba (modern Scotland) invades Northern Northumbria during the period of 850–858, burning Dunbar and Melrose.
 - The Pillar of Eliseg is erected by King Cyngen ap Cadell of Powys (Wales), as a memorial to his great-grandfather Elisedd ap Gwylog (or Eliseg) (approximate date).
 
Japan
- May 6 – Emperor Ninmyō dies after a 17-year reign. He is succeeded by his son Montoku, as the 55th emperor of Japan.
 
India
Mesoamerica
By topic
Food and Drink
Religion
Births
- June 27 – Ibrahim II, emir of the Aghlabids (d. 902)
 - Abu Zayd al-Balkhi, Muslim mathematician (d. 934)
 - Adelaide, queen of the West Frankish Kingdom (or 853)
 - Aribo of Austria, Frankish margrave (approximate date)
 - Arnulf of Carinthia, king of the East Frankish Kingdom (d. 899)
 - Berno of Cluny, Frankish abbot (approximate date)
 - Du Guangting, Chinese Taoist priest and writer (d. 933)
 - Gerolf of Holland, count of Friesland (approximate date)
 - Harald Fairhair, king of Norway (approximate date)
 - Hatto I, Frankish archbishop (approximate date)
 - Herbert I, count of Vermandois (approximate date)
 - Hermenegildo Gutiérrez, Galician nobleman (d. 912)
 - Hucbald, Frankish music theorist (or 840)
 - Ki no Tomonori, Japanese poet (approximate date)
 - Onneca Fortúnez, Basque princess (or 848)
 - Ranulf II, duke of Aquitaine (d. 890)
 - Reginar I, duke of Lorraine (approximate date)
 - Seiwa, emperor of Japan (d. 878)
 - Smbat I, king of Armenia (approximate date)
 - Tuotilo, German monk and composer (approximate date)
 
Deaths
- February 1 – Ramiro I, king of Asturias
 - May 6 – Ninmyō, emperor of Japan (b. 808)
 - April 18 – Perfectus, Spanish monk and martyr
 - July 14 – Wei Fu, chancellor of the Tang Dynasty
 - Amalarius, Frankish archbishop (approximate date)
 - Bishr al-Hafi, Muslim theologian (approximate date)
 - Eanred, king of Northumbria (approximate date)
 - Huangbo Xiyun, Chinese Zen Buddhist monk
 - Ishaq ibn Ibrahim, Muslim official and advisor
 - Li Deyu, chancellor of the Tang Dynasty (b. 787)
 - Muhammad ibn Mūsā al-Khwārizmī, Persian mathematician
 - Maura of Troyes, Frankish noblewoman and saint (b. 827)
 - Tachibana no Kachiko, empress of Japan (b. 786)
 - Stephen of Liège, Frankish bishop (approximate date)
 - Vlastimir, Serbian prince (approximate date)
 - William of Septimania, Frankish nobleman (b. 826)
 - Zhou Lin, governor (jiedushi) of the Tang Dynasty
 
References
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