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This article is about the year 849. For the number, see 849 (number).
|Centuries:||8th century – 9th century – 10th century|
|Decades:||810s 820s 830s – 840s – 850s 860s 870s|
|Years:||846 847 848 – 849 – 850 851 852|
|849 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1602|
|Chinese calendar||戊辰年 (Earth Dragon)
3545 or 3485
— to —
己巳年 (Earth Snake)
3546 or 3486
|- Vikram Samvat||905–906|
|- Shaka Samvat||770–771|
|- Kali Yuga||3949–3950|
|Japanese calendar||Kashō 2
|Minguo calendar||1063 before ROC
|Seleucid era||1160/1161 AG|
|Thai solar calendar||1391–1392|
- Battle of Ostia: An Saracen Arab fleet from Sardinia set sail towards Rome. In response, pope Leo IV forms a coalition of maritime Italian cities, including Naples, Amalfi and Gaeta led by admiral Caesar — which is assembled off the re-fortified port of Ostia — and repels the Saracen marauders. Their navy is scattered, resulting in many sunken vessels. Rome is saved from plunder and the expansion of the Aghlabids.
- Frankish forces under king Charles the Bald invade southern France and conquer the territory of Toulouse. He appoints Fredelo as count (comté) of Toulouse who founds the Rouergue dynasty. Aquitaine is submitted to the West Frankish Kingdom.
- Prince Bagrat II of Armenia (also called Arminiya) begins a rebellion against caliph Al-Mutawakkil of the Abbasid Caliphate.
- In the Chinese capital city of Chang'an, an imperial prince is impeached during the Tang Dynasty from his position by officials at court for erecting a building that obstructs a street in the northwesternmost ward in South Central Chang'an.
- King Pyinbya of Burma founds the city of Pagan located in the Mandalay Region and fortifies it with walls.
- Ali ibn al-Madini, Muslim scholar (b. 778)
- Conaing mac Flainn, king of Brega (Ireland)
- Connagan, bishop of Clonfert (Ireland)
- Guntbold, archbishop of Rouen
- Harthamah ibn al-Nadr, Muslim governor
- Itakh al-Khazari, Muslim general
- Ragenar, bishop of Amiens
- Theophylact, Byzantine co-emperor
- Walafrid Strabo, Frankish theological writer
- Zhang Zhongwu, Chinese general