840
| Millennium: | 1st millennium |
|---|---|
| Centuries: | 8th century · 9th century · 10th century |
| Decades: | 810s · 820s · 830s · 840s · 850s · 860s · 870s |
| Years: | 837 · 838 · 839 · 840 · 841 · 842 · 843 |
| 840 by topic | |
| Politics | |
| State leaders – Sovereign states | |
| Birth and death categories | |
| Births – Deaths | |
| Establishment and disestablishment categories | |
| Establishments – Disestablishments | |
| Gregorian calendar | 840 DCCCXL |
| Ab urbe condita | 1593 |
| Armenian calendar | 289 ԹՎ ՄՁԹ |
| Assyrian calendar | 5590 |
| Bengali calendar | 247 |
| Berber calendar | 1790 |
| Buddhist calendar | 1384 |
| Burmese calendar | 202 |
| Byzantine calendar | 6348–6349 |
| Chinese calendar | 己未年 (Earth Goat) 3536 or 3476 — to — 庚申年 (Metal Monkey) 3537 or 3477 |
| Coptic calendar | 556–557 |
| Discordian calendar | 2006 |
| Ethiopian calendar | 832–833 |
| Hebrew calendar | 4600–4601 |
| Hindu calendars | |
| - Vikram Samvat | 896–897 |
| - Shaka Samvat | 761–762 |
| - Kali Yuga | 3940–3941 |
| Holocene calendar | 10840 |
| Iranian calendar | 218–219 |
| Islamic calendar | 225–226 |
| Japanese calendar | Jōwa 7 (承和7年) |
| Javanese calendar | 737–738 |
| Julian calendar | 840 DCCCXL |
| Korean calendar | 3173 |
| Minguo calendar | 1072 before ROC 民前1072年 |
| Nanakshahi calendar | −628 |
| Seleucid era | 1151/1152 AG |
| Thai solar calendar | 1382–1383 |
| Wikimedia Commons has media related to 840. |

Emperor Lothair I (795–855)
Year 840 (DCCCXL) was a leap year starting on Thursday (link will display the full calendar) of the Julian calendar.
Events
By Place
Europe
- June 20 – Emperor Louis the Pious falls ill and dies at his hunting lodge on an island in the Rhine near his imperial palace at Ingelheim, while suppressing a revolt. His eldest son Lothair I succeeds him as Holy Roman Emperor and tries to seize all the territories of the late Charlemagne. The 17-year-old Charles the Bald becomes king of the Franks and joins the fight with his half-brother Louis the German in resisting Lothair.
Britain
- King Wigstan of Mercia, grandson of former ruler Wiglaf (see 839), declines his kingship and prefers the religious life. He asks his widowed mother, princess Ælfflæd to act as regent. A nobleman of the line of the late king Beornred, named Berhtric, wishes to marry her but he is a relative. Wigstan refuses the match and is murdered by followers of Berhtric at Wistow. He is buried at Repton Abbey and later revered as a saint. The Mercian throne is seized by Berhtric's father, Beorhtwulf.[1]
- Vikings make pernament settlements with their first 'wintering over' located at Lough Neagh in Northern Ireland (approximate date).
Asia
- Emperor Wen Zong (Li Ang) dies after a 13-year reign in which he has failed to break the power of his palace eunuchs. He is succeeded by his brother Wu Zong as Chinese ruler of the Tang Dynasty.
- The Yenisei Kirghiz settled along the Yenisei River, sack with a force of around 80,000 horsemen the Uyghur capital, Ordu-Baliq. Driving the Uyghurs out of Mongolia. End of the Uyghur Khaganate.[2]
By topic
Religion
- Nobis becomes bishop of St. David's in the Welsh Kingdom of Dyfed (approximate date).
Births
- January 19 – Michael III, Byzantine emperor (d. 867)
- Abu al-Hassan al-Nuri, Muslim sufi (approximate date)
- Adalhard II, Frankish nobleman (approximate date)
- Berengaudus, Benedictine monk (d. 892)
- Clement of Ohrid, Bulgarian scholar (approximate date)
- Eudokia Ingerina, Byzantine empress (approximate date)
- Hucbald, Frankish music theorist (or 850)
- Lothar I, Frankish nobleman (d. 880)
- Notker the Stammerer, Benedictine monk (approximate date)
- Richardis, Frankish empress (approximate date)
- Sunyer II, Frankish nobleman (approximate date)
- Theodard, archbishop of Narbonne (approximate date)
- Theodore II, pope of the Catholic Church (d. 897)
- Unruoch III, margrave of Friuli (approximate date)
- Ya'qub ibn al-Layth, founder of the Saffarid Dynasty (d. 879)
Deaths
- March 14 – Einhard, Frankish scholar
- June 11 – Junna, emperor of Japan (b. 785)
- June 16 – Rorgon I, Frankish nobleman (or 839)
- June 20 – Louis the Pious, king of the Franks (b. 778)
- Agobard, archbishop of Lyon (b. 779)
- Andrew II, duke of Naples
- Ansovinus, archbishop of Camerino
- Czimislav, king of the Sorbs (approximate date)
- He Jintao, general of the Tang Dynasty
- Hilduin, archbishop of Paris (b. 775)
- Li Chengmei, prince of the Tang Dynasty
- Li Rong, prince of the Tang Dynasty
- Salmawaih ibn Bunan, Muslim physician
- Wen Zong, emperor of the Tang Dynasty (b. 809)
- Wigstan, king of Mercia (approximate date)
- Yang, consort and concubine of Wen Zong
References
- ↑ Zaluckyj & Zaluckyj, "Decline", pp. 238–239.
- ↑ History of Central Asia.
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