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This article is about the year 830. For the number, see 830 (number).
|Centuries:||8th century – 9th century – 10th century|
|Decades:||800s 810s 820s – 830s – 840s 850s 860s|
|Years:||827 828 829 – 830 – 831 832 833|
|830 by topic|
|State leaders – Sovereign states|
|Birth and death categories|
|Births – Deaths|
|Establishment and disestablishment categories|
|Establishments – Disestablishments|
|Ab urbe condita||1583|
|Chinese calendar||己酉年 (Earth Rooster)
3526 or 3466
— to —
庚戌年 (Metal Dog)
3527 or 3467
|- Vikram Samvat||886–887|
|- Shaka Samvat||752–753|
|- Kali Yuga||3931–3932|
|Japanese calendar||Tenchō 7
|Minguo calendar||1082 before ROC
|Seleucid era||1141/1142 AG|
|Thai solar calendar||1372–1373|
- 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).
- Adalard, Frankish nobleman (approximate date)
- Carloman of Bavaria, Frankish king (or 828)
- Charles, Frankish bishop (or 825)
- Engelberga, Frankish empress (approximate date)
- Irmgard, Frankish abbess (or 833)
- Junayd of Baghdad, Muslim sufi (d. 910)
- Kōkō, emperor of Japan (d. 887)
- Robert the Strong, Frankish nobleman (approximate date)
- Rimbert, Frankish archbishop (d. 888)
- Rurik, prince of Novgorod (approximate date)
- Wulgrin I, Frankish count (approximate date)
- Ashot I, prince of Iberia (or 826)
- Eardwulf, king of Northumbria (approximate date)
- Egfrid, bishop of Lindisfarne
- "Al-Qayrawan hospital, Tunisia in 830". Retrieved November 8, 2011.
- Swanton, Anglo-Saxon Chronicle, pp. 62–63.