The 840s decade ran from January 1, 840, to December 31, 849.
Significant people
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Al-Mu'tasim
Abū Isḥāq Muḥammad ibn Hārūn al-Rashīd (; October 796 – 5 January 842), better known by his laqab, regnal name al-Muʿtaṣim biʾllāh (, ), was the eighth Abbasid Caliphate, Abbasid caliph, ruling from 833 until his death in 842. ...
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Al-Wathiq
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Alfred the Great
Alfred the Great ( ; – 26 October 899) was King of the West Saxons from 871 to 886, and King of the Anglo-Saxons from 886 until his death in 899. He was the youngest son of King Æthelwulf and his first wife Osburh, who both died when Alfr ...
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Louis the Pious
Louis the Pious (; ; ; 16 April 778 – 20 June 840), also called the Fair and the Debonaire, was King of the Franks and Holy Roman Emperor, co-emperor with his father, Charlemagne, from 813. He was also King of Aquitaine from 781. As the only ...
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Charles the Bald
Charles the Bald (; 13 June 823 – 6 October 877), also known as CharlesII, was a 9th-century king of West Francia (843–877), King of Italy (875–877) and emperor of the Carolingian Empire (875–877). After a series of civil wars during t ...
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Ermentrude of Orléans
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Louis the Stammerer
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Louis the German
Louis the German (German language, German: ''Ludwig der Deutsche''; c. 806/810 – 28 August 876), also known as Louis II of Germany (German language, German: ''Ludwig II. von Deutschland''), was the first king of East Francia, and ruled from 8 ...
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Lothair I
Lothair I (9th. C. Frankish: ''Ludher'' and Medieval Latin: ''Lodharius''; Dutch and Medieval Latin: ''Lotharius''; German: ''Lothar''; French: ''Lothaire''; Italian: ''Lotario''; 795 – 29 September 855) was a 9th-century emperor of the ...
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Kenneth I of Scotland
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Ragnar Lodbrok
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Michael III
Michael III (; 9/10 January 840 – 24 September 867), also known as Michael the Drunkard, was Byzantine emperor from 842 to 867. Michael III was the third and traditionally last member of the Amorian dynasty, Amorian (or Phrygian) dynasty. He ...
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