830
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| Years: 826 827 828 829 - 830 - 831 832 833 834 |
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| Decades: 800s 810s 820s - 830s - 840s 850s 860s |
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| Centuries: 8th century - 9th century - 10th century |
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| 830 by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishments and disestablishments categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 830 DCCCXXX |
| Ab urbe condita | 1583 |
| Armenian calendar | 279 ԹՎ ՄՀԹ |
| Bahá'í calendar | -1014 – -1013 |
| Buddhist calendar | 1374 |
| Chinese calendar | 3466/3526-12-3 (己酉年十二月初三日) — to —
3467/3527-12-13(庚戌年十二月十三日) |
| Ethiopian calendar | 822 – 823 |
| Hebrew calendar | 4590 – 4591 |
| Hindu calendars | |
| - Vikram Samvat | 885 – 886 |
| - Shaka Samvat | 752 – 753 |
| - Kali Yuga | 3931 – 3932 |
| Holocene calendar | 10830 |
| Iranian calendar | 208 – 209 |
| Islamic calendar | 214 – 215 |
| Japanese calendar | |
| - Imperial Year | Kōki 1490 (皇紀1490年) |
| - Jōmon Era | 10830 |
| Julian calendar | 875 |
| Korean calendar | 3163 |
| Thai solar calendar | 1373 |
Events
- Christian missionary Ansgar visits Birka, trade city of the Swedes.
- 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.
- Borobodur is completed as a Buddhist monument, after about 50 years of work.
Births
- Emperor Kōkō, emperor of Japan (d. 887)
- Carloman, King of Bavaria (d. 880)
- Dae Ijin, king of Korean-Manchurian kingdom of Balhae (d. 857)
Deaths
