840
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| Years: 836 837 838 839 - 840 - 841 842 843 844 |
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| Decades: 810s 820s 830s - 840s - 850s 860s 870s |
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| Centuries: 8th century - 9th century - 10th century |
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| 840 by topic | |
| Politics | |
| State leaders - Sovereign states | |
| Birth and death categories | |
| Births - Deaths | |
| Establishments and disestablishments categories | |
| Establishments - Disestablishments | |
| Gregorian calendar | 840 DCCCXL |
| Ab urbe condita | 1593 |
| Armenian calendar | 289 ԹՎ ՄՁԹ |
| Bahá'í calendar | -1004 – -1003 |
| Buddhist calendar | 1384 |
| Chinese calendar | 3476/3536-11-23 (己未年十一月廿三日) — to —
3477/3537-12-4(庚申年十二月初四日) |
| Ethiopian calendar | 832 – 833 |
| Hebrew calendar | 4600 – 4601 |
| Hindu calendars | |
| - Vikram Samvat | 895 – 896 |
| - Shaka Samvat | 762 – 763 |
| - Kali Yuga | 3941 – 3942 |
| Holocene calendar | 10840 |
| Iranian calendar | 218 – 219 |
| Islamic calendar | 225 – 226 |
| Japanese calendar | |
| - Imperial Year | Kōki 1500 (皇紀1500年) |
| - Jōmon Era | 10840 |
| Julian calendar | 885 |
| Korean calendar | 3173 |
| Thai solar calendar | 1383 |
Events
- After the death of Louis the Pious, his sons Lothar, Charles the Bald and Louis the German fight over the division of the Holy Roman Empire, with Lothar succeeding as Emperor.
- Tang Wu Zong succeeds Tang Wen Zong as emperor of China.
- Foundation of Dublin by Vikings.
Deaths
- June 20 - Louis the Pious, King of the Franks, Emperor of the Holy Roman Empire (b. 778)
- Emperor Junna, Emperor of Japan (b. 786)
