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This article is about the year 831. For the number, see 831 (number). For the area code, see Area code 831.
|Centuries:||8th century – 9th century – 10th century|
|Decades:||800s 810s 820s – 830s – 840s 850s 860s|
|Years:||828 829 830 – 831 – 832 833 834|
|831 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1584|
|Chinese calendar||庚戌年 (Metal Dog)
3527 or 3467
— to —
辛亥年 (Metal Pig)
3528 or 3468
|- Vikram Samvat||887–888|
|- Shaka Samvat||753–754|
|- Kali Yuga||3932–3933|
|Japanese calendar||Tenchō 8
|Minguo calendar||1081 before ROC
|Seleucid era||1142/1143 AG|
|Thai solar calendar||1373–1374|
- Byzantine–Arab War: Emperor Theophilos invades the Abbasid dominions and reaches the Euphrates River in north-eastern Syria. He captures and sacks the city of Tarsus, but is defeated in Cappadocia.
- Muslim Arabs under caliph Al-Ma'mun launch an invasion into Anatolia (modern Turkey) and capture a number of Byzantine forts. Heraclea Cybistra and Tyana fall to the Arabs.
- Fall – Muslim Arabs re-invade Sicily and lay siege to Palermo. Symeon, Byzantine commander of the imperial bodyguard (spatharios), surrenders the city in exchange for an safe departure.
- Emperor Louis the Pious is reinstated as sole ruler of the Frankish Empire. He promise his sons Pepin I and Louis the German a greater shares of the inheritance. His eldest son Lothair I is pardoned, but disgraced and banished to Italy.
- February – Empress Judith stands trial to "undergo the judgment of the Franks" for a assembly arranged by Louis the Pious. She is exiled and send to the convent of St. Radegund at Poitiers.
- Omurtag, ruler (khan) of the Bulgarian Empire, dies after a 17-year reign. He is succeeded by his youngest son Malamir, because his older brother Enravota favoured Christianity.
- Nominoe, duke of Brittany, is designed missus imperatoris (imperial emissary) by Louis the Pious at Ingelheim (modern Germany).
- An Uyghur Turk sues the son of a Chinese general who had failed to repay a debt of 11 million government-issued copper coins. Emperor Wen Zong hears the news, and is so upset that he not only banishes the general, but attempts to ban all trade between Chinese and foreigners except for goods and livestock. This ban is unsuccessful, and trade with foreigners resumes, especially in maritime affairs overseas.
- Summer – Ansgar, Frankish missionary, founds the first church at Birka (modern Sweden).
- Ansgar is consecrated, he travels to Rome to receive the pallium from pope Gregory IV.
- December 26 – Euthymius of Sardis, Byzantine monk and bishop
- Omurtag, ruler (khan) of the Bulgarian Empire
- Sadyrnfyw, Welsh bishop (approximate date)
- Xue Tao, female Chinese poet (b. 768)
- Yuan Zhen, politician of the Tang Dynasty (b. 779)
- Nelson, Janet L. The Annals of St-Bertin. Manchester: Manchester UP, 1991. Print.
- Smith, p. 83.