840
This article is about the year 840. For the number, see 840 (number).
| 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 | 762–763 | 
| - Kali Yuga | 3941–3942 | 
| Holocene calendar | 10840 | 
| Iranian calendar | 218–219 | 
| Islamic calendar | 225–226 | 
| Japanese calendar | Jōwa 7 (承和7年)  | 
| Julian calendar | 840 DCCCXL  | 
| Korean calendar | 3173 | 
| Minguo calendar | 1072 before ROC 民前1072年  | 
| Seleucid era | 1151/1152 AG | 
| Thai solar calendar | 1382–1383 | 

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
- Abu al-Hassan al-Nuri, Muslim sufi (approximate date)
 - Clement of Ohrid, Bulgarian scholar (approximate date)
 - Eudokia Ingerina, Byzantine empress (approximate date)
 - January 19 – Michael III, Byzantine emperor (d. 867)
 - 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
- Agobard, archbishop of Lyon (b. 779)
 - Ansovinus, archbishop of Camerino
 - Czimislav, king of the Sorbs (approximate date)
 - March 14 – Einhard, Frankish scholar
 - Hilduin, archbishop of Paris (b. 775)
 - Li Chengmei, prince of the Tang Dynasty
 - June 20 – Louis the Pious, king of the Franks (b. 778)
 - June 11 – Junna, emperor of Japan (b. 785)
 - June 16 – Rorgon I, Frankish nobleman (or 839)
 - Wen Zong, emperor of the Tang Dynasty (b. 809)
 - Wigstan, king of Mercia (approximate date)
 
References
- ↑ Zaluckyj & Zaluckyj, "Decline", pp. 238–239.
 - ↑ History of Central Asia.
 
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