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|Centuries:||8th century – 9th century – 10th century|
|Decades:||800s 810s 820s – 830s – 840s 850s 860s|
|Years:||830 831 832 833 834 835 836 837 838 839|
|Births – Deaths – By country
Establishments – Disestablishments
This is a list of events occurring in the 830s, ordered by year.
- Borobodur is completed as a Buddhist monument, after about 50 years of work.
- Nandivarman III defeats the Pandyans at the Battle of Tellaru.
- Earliest date of composition for the Historia Brittonum, attributed to Nennius, and known for its list of 12 battles of King Arthur.
- Egbert of Wessex defeats the Welsh.
- Christian missionary Ansgar visits Birka, trade city of the Swedes.
- In this year, an Uyghur Turk sues the son of a Chinese Tang Dynasty grand general who had failed to repay a debt of 11 million government-issued copper coins. Emperor Wenzong of Tang soon 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.
- Large-scale Abbasid raid under Caliph al-Ma'mun into Cappadocia. Heraclea Cybistra and Tyana fall to the Arabs, and the Byzantine emperor Theophilos is defeated by Al-Abbas ibn al-Ma'mun
- Malamir succeeds Omurtag as Khan of Bulgaria.
- The Saracens capture Palermo.
- Louis the Pious is reinstated following the end of the first civil war of his reign.
- Nominoe is designed missus imperatoris by Louis the Pious and ducatus ipsius gentis of the Bretons.
- The strategically important Byzantine fortress of Loulon falls to the Abbasids.
- Pepin I of Aquitaine and Louis the German revolt against Louis the Pious, Emperor of the Franks.
- The legendary genesis of the Flag of Scotland, appearing to Óengus (II) of Fortriu the night before a battle between his Pictish and Scottish forces against the Angles.
- Clondalkin, Ireland is sacked by Vikings.
- Theophilus forbids the usage of icons, establishing strict punishments.
- The second St Mark's Basilica in Venice (replacing an older church at a different location) is built.
- al-Mu'tasim succeeds his brother Al-Ma'mun as Abbasid caliph.
- Emperor Nimmyō succeeds Emperor Junna as emperor of Japan.
- A biography of Muhammad by Ibn Ishaq is edited.
- The Vikings first raid Dorestad (present-day Netherlands).
- Summer – The Viking ship of Oseberg is buried in a mound.
- Unuist is succeeded by Drest IV as king of the Picts.
- First known mention of Binsdorf, oldest part of Geislingen, and of Werne in Westphalia, Germany.
- Jona River in Switzerland was first mentioned
- Ragnar Lodbrok rises to power (approximate date).
- The celebration of All Saints is made an obligation throughout the Frankish Empire and fixed on November 1.
- The Vikings raid Dorestad.
- December 14 – Sweet Dew Incident: In the northeast sector of the Chinese capital Chang'an, after a failure by the chancellor Li Xun to slaughter the powerful eunuchs, troops under the eunuchs' command slaughter many court officials and Li Xun's associates.
- Egbert of Wessex is defeated by the Danes.
- Presian succeeds Malamir as Khan of Bulgaria.
- Oldest known mentioning of the city of Soest, Germany.
- Petrus Tradonicus Pola appointed Roman consul and duke of Venice.
- Pietro Tradonico is elected Doge of Venice.
- Gioanni Lampel commences the era of Gioanni in Florence.
- Uen succeeds Drest IV as king of the Picts.
- Saracens from Egypt attack the Italian city of Naples.
- Vikings from Scandinavia attack Constantinople.
- April 10 – Comet Halley passes approximately 5 million km from Earth – its closest ever approach to Earth.
- July 22 – Arab–Byzantine wars: The Byzantine emperor Theophilos is heavily defeated at the Battle of Anzen by the Abbasids. Caliph al-Mu'tasim then proceeds to capture and raze Amorium, the native city of the Byzantine Empire's reigning Amorian dynasty.
- Mid-August – Arab–Byzantine wars: Sack of Amorium by the Abbasid Caliphate.
- Discovery of a conspiracy to assassinate Caliph Mu'tasim and place his nephew Al-Abbas ibn al-Ma'mun on the throne. A widespread purge of the army follows, which cements the leading role of the Turkish ghilman in the Abbasid military establishment.
- Yezidi uprising against the Abbasids.
- At the Battle of Hingston Down, Egbert of Wessex beats the Danish and the West Welsh (Cornish).
- The Stone of Destiny is placed at Scone Palace, Scotland.
- Rheine is founded on the Ems River.
- A royal meeting between Feidlimid mac Cremthanin, King of Cashel and Niall, King of the Southern Uí Neill and Tara at Cluain-Conaire-Tommain, results in Feidlimid becoming High-King of Ireland, according to the Annals of Inisfallen.
- Louis the Pious attempts to divide his empire among his sons.
- Ethelwulf succeeds Egbert as king of Wessex.
- Uen is succeeded by Uurad as king of the Picts.
- The reign of Alpin II of Dalriada begins (approximate date).
- The Balaton principality is created.
- The Saracen troops established in the South pillage Ancona in Central Italy.
- "Al-Qayrawan hospital, Tunisia in 830". Retrieved 8 November 2011.
- M. Th. Houtsma, 1993, E. J. Brill's First Encyclopaedia of Islam, 1913-1936: Volume 4 - Page 1136, Brill