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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.
- June 5 – Emperor Theophilos (16-years-old) marries the Armenian noblewoman Theodora in Hagia Sophia at Constantinople. He has her chosen during a representation of a bride-show, she becomes empress (Augusta) of the Byzantine Empire.
- Byzantine–Arab War: Muslim reinforcements from Ifriqiya and Al-Andalus (modern Spain) defeat Byzantine forces under Theodotus in Sicily, but a plague once again force them to retreat to Mazara del Vallo and evacuate to North Africa. Creation of the Ad-dimnah hospital (bimaristan) in Kairouan (modern Tunisia) by the Aghlabid emir Ziyadat Allah I.
- Emperor Louis the Pious returns from a campaign in Brittany and is captured by his son Pepin I, king of Aquitaine. He is put under house arrest at Compiegne and his wife Judith is incarcerated at Poitiers.
- Borobodur in Magelang, Central Java (modern Indonesia), is completed as a Buddhist monument, after about 50 years of work (approximate date).
- Battle of Tellaru: King Nandivarman III defeats the Pandyans led by his rival Srimara Srivallabha at Vandavasi (modern India).
- Nennius, Welsh abbot of Bangor Fawr, compiles the Historia Brittonum. He is also known for its list of 12 battles of King Arthur (approximate date).
- Hirsau Abbey (modern Germany) is founded by the Rhenish Franconian count Erlafried of Calw (approximate date).
- Ansgar, Frankish missionary, visits the trade city Birka located at Lake Mälaren in Sweden (approximate date).
- 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.
- Byzantine–Arab War: The Byzantine fortress of Loulon (modern Turkey) is captured by the Abbasids. Its garrison surrenders to caliph Al-Ma'mun after a lengthy siege.
- Pepin I, king of Aquitaine, and his brother Louis the German revolt against their father, emperor Louis the Pious. They gather an army of Slav allies and conquer Swabia.
- Berengar the Wise, count (or duke) of Toulouse, attacks the Frankish domains of Bernard of Septimania, taking Roussillon (with Vallespir), Razès, and Conflent.
- The Flag of Scotland: According to legend, king Óengus II of Fortriu leads an army of Picts and Scots against the invading Angles from Northumbria, near Athelstaneford.
- The town of Clondalkin (modern Ireland) is sacked by Vikings from Denmark and the monastery is burnt to the ground.
- Emperor Theophilos promulgates a new edict against the usage of icons in the Byzantine Empire. He establishes strict punishments against idolators and persecutes violators.
- The second St. Mark's Basilica in Venice (replacing an older church at a different location) is built and becomes one of the best known examples of Italo-Byzantine architecture.
- Byzantine-Arab War: Emperor Theophilos signs a armistice for peace with the Abbasid Caliphate. He offers caliph Al-Ma'mun 100,000 gold dinars in return of 7,000 Byzantine prisoners.
- June – Lothair I, eldest son of emperor Louis the Pious, joins the rebellion of his brothers Pepin I and Louis the German, with the assistance of archbishop Ebbo. Louis is on the plains of Rothfield (near Colmar) forced to abdicate.
- Mojmir I, Moravian duke, expels prince Pribina from his homeland. He unifies Great Moravia (modern Czech Republic) and becomes the first known ruler of the Moravian Slavs who founds the House of Mojmir (approximate date).
- Galindo Aznárez I, Frankish count, usurpes the Catalan counties (pagi) of Pallars and Ribagorza in the Spanish March (modern Spain). A buffer zone between the Pyrenees and the Ebro River.
- August 9 – Caliph Al-Ma'mun dies after a 20-year reign. He is succeeded by his half-brother Al-Mu'tasim as ruler of the Abbasid Caliphate, making Samarra his capital.
- Ibn Ishaq, Arab historian, collects oral traditions that forms the basis of the biography of the islamic prophet Muhammad.
- Emperor Junna abdicates the throne after a 10-year reign. He is succeeded by his nephew Nimmyō as the 54th emperor of Japan.
- March 1 – Emperor Louis the Pious is restored as sole ruler of the Frankish Empire. After his re-accession to the throne, his eldest son Lothair I flees to Burgundy.
- Danish Vikings raid the trading settlement of Dorestad (present-day Wijk bij Duurstede), located in the south-east of the province of Utrecht (modern Netherlands).
- Summer – The Viking ship of Oseberg near Tønsberg (modern Norway) is buried in a mound, during the Viking Age (approximate date).
- First mention of the Jona River ('the cold one') in Switzerland (approximate date).
- King Óengus II dies after a 14-year reign. He is succeeded by his nephew Drest IX as ruler of the Picts.
- July 20 – Ansegisus, Frankish abbot and advisor of former emperor Charlemagne, dies at Fontenelle Abbey in Normandy (or 833).
- Ragnar Lodbrok, a Norse Viking ruler, rises to power. He becomes the scourge of France and England (approximate date).
- Danish Viking raiders ally with the Cornish against the rule of king Egbert of Wessex (approximate date).
- The Isle of Sheppey off the northern coast of Kent comes under Viking attack, during the Viking Age.
- December 14 – Sweet Dew Incident: Emperor Wen Zong plans a plot to free the court from the influence of his palace eunuchs. In the northeast sector of the capital Chang'an, after a failure of his chancellor Li Zhongyan, troops under the eunuchs' command slaughter many officials and other associates.
- November 1 – Pope Gregory IV promotes the celebration of the feast of All Saints throughout the Frankish Empire.
- Malamir, ruler (khan) of the Bulgarian Empire, dies after a 5-year reign and is succeeded by his nephew Presian I. Because of his young age and inexperience, the Bulgarian state affairs are dominated by his minister and commander-in-chief Isbul.
- July 4 – Pactum Sicardi: Prince Sicard of Benevento signs a 5-year armistice with the duchies of Sorrento, Naples and Amalfi. He recognizes the trade of merchants between the three cities in Southern Italy.
- Pietro Tradonico is appointed Roman consul and doge of Venice (until 864).
- Danish Vikings arrive in West Saxon North Devon and Somerset. King Egbert of Wessex fights them at the Battle of Carhampton, but he is forced to withdraw.
- The Basilica of St. Castor in Koblenz (Rhineland-Pfalz) is constructed.
- Oldest known mentioning of the city of Soest (modern Germany).
- Byzantine–Arab War: Emperor Theophilos leads an Byzantine expeditionary force (70,000 men) into Mesopotamia. He sacks the cities Arsamosata and Sozopetra — which some sources claim as the birthplace of Abbasid caliph Al-Mu'tasim — and forces Melitene to pay tribute.
- The Slavs in the vicinity of Thessaloniki revolt against the Byzantine Empire. Theophilos undertakes a evacuation of some Byzantine captives who are settled in trans-Danubian Bulgaria.
- Persian I, ruler (khan) of the Bulgarian Empire, sends his prime-minister Isbul against the Smolyani (a Slavic tribe in Byzantine territory near the Struma River). The Bulgarian army campaigns along the Aegean coasts, and conquers most of Thrace and Macedonia including the fortress city of Philippi (see Presian Inscription).
- The city of Naples (modern Italy) is attacked by the Saracens from Egypt demanding an annual payment (approximate date).
- King Drest IX dies after a 3-year reign. He is succeeded by his cousin Eóganan as ruler of the Picts.
- July 22 – Battle of Dazimon: Caliph Al-Mu'tasim launches a major punitive expedition against the Byzantine Empire, targeting the two major Byzantine fortress cities of central Anatolia, Ancyra and Amorium. He mobilishes a vast army (80,000 men) at Tarsus, which is divided into two main forces. The northern force, under commander Al-Afshin, invades the Armeniac Theme from the region of Melitene, joining up with the forces of the city's emir, Umar al-Aqta. The southern, main force, under Al-Mu'tasim, passes the Cilician Gates into Cappadocia. Emperor Theophilos attacks the Abbasids, inflicting 3,000 casualties but is later heavily defeated by a counter-attack of 10,000 Turkish horse archers. Theophilos with his guard are encircled, and barely manage to break through and escape.
- Summer – Siege of Amorium: The Abbasids besiege the Byzantine fortress city of Amorium which is protected by 44 towers, according to the contemporary geographer Ibn Khordadbeh. Both besiegers and besieged have many siege engines, and for several days both sides exchange missile fire. However, an Muslim prisoner defects to Al-Mu'tasim, and informs him about a place in the wall which has been badly damaged by heavy rainfall. The Abbasids concentrate their hits on this section, and after two days manage to breach the city wall. After two weeks of repeated attacks, the Byzantine defenders surrender. The city is sacked and plundered, 70,000 inhabitants are slaughtered and the surviving population is sold as slaves.
- Pepin I, king of Aquitaine, dies after a 21-year reign. Emperor Louis the Pious appoints his youngest son Charles the Bald as his successor. The Aquitainian nobility, however, elects Pepin's son Pepin II as new Frankish ruler.
- Battle of Hingston Down: The West Saxons led by king Egbert of Wessex defeat a combined force of Cornish and Danish Vikings at Hingston Down in Cornwall.
- Fedelmid mac Crimthainn, king of Munster, calls for a great royal meeting at Cluain-Conaire-Tommain between him and king Niall Caille mac Áeda of Uí Néill.
- Approximate date – The Stone of Destiny, an oblong block of red sandstone, is placed at Scone Palace for the coronation of the first monarchs of Scotland.
- Discovery of a conspiracy led by general 'Ujayf ibn 'Anbasa to assassinate Al-Mu'tasim while he is campaigning, 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 slave-soldiers (ghilman) in the Abbasid military establishment.
- Babak Khorramdin, a Persian military leader, is cruelly executed by order of Al-Mu'tasim.
- Approximate date – Yezidi uprising against the Abbasids.
- Oldest known mentioning of the city of Rheine on the Ems River (modern Germany).
- Approximate date – The Khazars convert to Judaism.
- Prince Sicard of Benevento is assassinated by a conspiracy among the nobility. He is succeeded by Radelchis I, chief army officer and treasurer of Sicard, who proclaims himself ruler of Benevento. He imprisons Siconulf, heir and brother of Sicard, in Taranto. But Amalfitan merchants led by Landulf I the gastald of Capua and, with support of Guaifer, rescue him from prison. Siconulf is proclaimed prince of Salerno, and a civil war erupts which splits the Lombard principality in Southern Italy.
- Third Civil War: King Louis the German, grandson of Charlemagne, invades Swabia. His nephew Pepin II of Aquitaine and his Gascon subjects conquers territory all the way to the Loire.
- Approximate date – Danish Vikings return to ravage the Frisian coast (sacking Dorestad for the second time).
- King Egbert of Wessex dies after a 37-year reign and is succeeded by his son Æthelwulf ("Noble Wolf") as ruler of Wessex. Æthelwulf's eldest son Æthelstan, is made sub-king of Kent, Essex, Surrey and Sussex under his father.
- Approximate date – Alpín II begins his reign as king of Dál Riata (modern Scotland).
- "Al-Qayrawan hospital, Tunisia in 830". Retrieved November 8, 2011.
- Swanton, Anglo-Saxon Chronicle, pp. 62–63.
- Nelson, Janet L. The Annals of St-Bertin. Manchester: Manchester UP, 1991. Print.
- Smith, p. 83.
- Brooks 1923, p. 128.
- Bury 1912, pp. 254, 474–477.
- J. Norwich, Byzantine: The Apogee, p. 47.
- Bush, Robin (1994). Somerset: The complete guide. Wimborne, Dorset: Dovecote Press, pp. 55–56. ISBN 1-874336-26-1.
- W. Treadgold, A History of the Byzantine State and Society, p. 440
- John V.A. Fine, Jr. (1991). The Early Medieval Balkans: A Critical Survey from the Sixth to the Late Twelfth Century, p. 109. ISBN 978-0-472-08149-3
- Treadgold 1997, p. 441.
- Haldon 2001, p. 80.
- Kiapidou 2003, Chapter 1.
- Charles-Edwards, pp. 428–31; Padel, "Cornwall", Davies, p. 342; Stenton, p. 235.
- Annals of Innisfallen, 838. Seán Mac Airt, The Annals of Innisfallen Dublin: 1951 available at UCC Celt Website.
- The Golden Age of Islam by Maurice Lombard, p. 152. ISBN 1-55876-322-8.
- M. Th. Houtsma, 1993, E. J. Brill's First Encyclopaedia of Islam, 1913-1936: Volume 4 - p. 1136, Brill.
- Kreutz, Barbara M (1991). Before the Normans: Southern Italy in the Ninth and Tenth Centuries, p. 23 (University of Pennsylvania, Press: Philadelphia).
- Williams 1991a; Stenton 1971, p. 231; Kirby 2000, pp. 155–56.