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This article is about the year 846. For the number, see 846 (number).
|Centuries:||8th century – 9th century – 10th century|
|Decades:||810s 820s 830s – 840s – 850s 860s 870s|
|Years:||843 844 845 – 846 – 847 848 849|
|846 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1599|
|Chinese calendar||乙丑年 (Wood Ox)
3542 or 3482
— to —
丙寅年 (Fire Tiger)
3543 or 3483
|- Vikram Samvat||902–903|
|- Shaka Samvat||767–768|
|- Kali Yuga||3946–3947|
|Japanese calendar||Jōwa 13
|Minguo calendar||1066 before ROC
|Seleucid era||1157/1158 AG|
|Thai solar calendar||1388–1389|
- Byzantine–Bulgarian War: The Bulgarians violate the peace treaty (see 815) and invade Macedonia along the River Struma. The cities of Serres and Philippi are devastated.
- Summer – Breton forces under Nominoe occupy the Frankish cities of Nantes and Rennes. He makes raids in Anjou and threatens Bayeux. King Charles the Bald recognizes him as duke of Brittany.
- Prince Pribina becomes a vassal of the Frankish Empire. King Louis the German grants him land near Lake Balaton (modern Hungary). He establishes Blatnohrad, capital of Balaton Principality.
- Frankish forces led by Louis the German invade Moravia. They encounter little resistance and deprive king Mojmir I from the throne. His relative, Rastislav is set up as the new client ruler.
- The Mozarabs, Iberian Christians who live under Moorish rule, try to repopulate León in Al-Andalus (modern Spain). The city is recaptured by the Muslim Arabs.
- King Æthelred II of Northumbria sends military assistance to the Picts in their fight against the invading Scots (approximate date).
- Máel Sechnaill mac Máele Ruanaid becomes the first High King of Ireland.
- An Saracen Arab expeditionary force from Africa, consisting of 11,000 men and 500 horses, raid the outskirts of Rome. Sacking the basilicas of Old St. Peter's and St. Paul's Outside the Walls.
- April 22 – Emperor Wu Zong (Li Chan) dies after a 6-year reign. He is succeeded by his uncle Xuān Zong as Chinese ruler of the Tang Dynasty.
- Jang Bogo, a powerful maritime hegemon of Silla, is assassinated by aristocratic elements at his garrison headquarters by Yeom Jang (or 841).
- Hasan al-Askari, 11th Shia Imam (d. 874)
- November 1 – Louis the Stammerer, king of West Francia (d. 879)
- Rollo, Viking leader and count (approximate date)
- Bai Ju Yi, Chinese poet and official (b. 772)
- Jang Bogo, Korean maritime hegemon (or 841)
- Mojmir I, king of Moravia (approximate date)
- Niall Caille, High King of Ireland
- April 22 – Wu Zong, Chinese emperor of the Tang Dynasty (b. 814)