Magnus Decentius (died 18 August 353) was ''

caesar Gaius Julius Caesar (12 or 13 July 100 BC – 15 March 44 BC) was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war. He ...

'' of the

Western Roman Empire In modern historiography, the Western Roman Empire was the western provinces of the Roman Empire, collectively, during any period in which they were administered separately from the eastern provinces by a separate, independent imperial court. ...

from 350 to 353, under his brother

Magnentius Magnus Magnentius ( 303 – 10 August 353) was a Roman general and usurper against Constantius II. Of Germanic descent, Magnentius served with distinction in Gaul, where the army chose him as a replacement for the unpopular emperor Constans. Ac ...

History

Nothing is known of Decentius prior to 350. Magnentius usurped power from

Constans Flavius Julius Constans ( 323 – 350), also called Constans I, was Roman emperor from 337 to 350. He held the imperial rank of '' caesar'' from 333, and was the youngest son of Constantine the Great. After his father's death, he was made ''a ...

on 18 January 350, and elevated Decentius as ''caesar'' later that year, perhaps in July or August. He was appointed

consul Consul (abbrev. ''cos.''; Latin plural ''consules'') was the title of one of the two chief magistrates of the Roman Republic, and subsequently also an important title under the Roman Empire. The title was used in other European city-states thro ...

in 352. In the following year, after he had lost the battle of Mursa Major, Magnentius' exactions to finance the war drove Gaul into revolt against his dictatorial rule, and Decentius was expelled from the capital, Treves, which headed the revolt. The

Alamanni The Alemanni or Alamanni were a confederation of Germanic tribes * * * on the Upper Rhine River during the first millennium. First mentioned by Cassius Dio in the context of the campaign of Roman emperor Caracalla of 213 CE, the Alemanni c ...

began to invade the province, perhaps at the instigation of the emperor

Constantius II Constantius II (; ; 7 August 317 – 3 November 361) was Roman emperor from 337 to 361. His reign saw constant warfare on the borders against the Sasanian Empire and Germanic peoples, while internally the Roman Empire went through repeated civ ...

in order to increase pressure on the usurper. Decentius, who led his brother's forces in the north, was defeated in a pitched battle by the Alemannic chief Chnodomar, and besieged in

Sens Sens () is a Communes of France, commune in the Yonne Departments of France, department in Bourgogne-Franche-Comté in north-central France, 120 km southeast from Paris. Sens is a Subprefectures in France, sub-prefecture and the second la ...

. There news reached him of Constantius' victory at the Battle of Mons Seleucus, and the subsequent suicide of Magnentius. Decentius hung himself, signalling the end of the civil war.Gibbon, chap. XVIII., p. 597.

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* * *

Ammianus Marcellinus Ammianus Marcellinus, occasionally anglicized as Ammian ( Greek: Αμμιανός Μαρκελλίνος; born , died 400), was a Greek and Roman soldier and historian who wrote the penultimate major historical account surviving from antiquit ...

''Res Gestae'', XVI
*

Edward Gibbon Edward Gibbon (; 8 May 173716 January 1794) was an English essayist, historian, and politician. His most important work, ''The History of the Decline and Fall of the Roman Empire'', published in six volumes between 1776 and 1789, is known for ...

789(1932) ''

The History of the Decline and Fall of the Roman Empire ''The History of the Decline and Fall of the Roman Empire'', sometimes shortened to ''Decline and Fall of the Roman Empire'', is a six-volume work by the English historian Edward Gibbon. The six volumes cover, from 98 to 1590, the peak of the Ro ...

''. The Modern Library.

External links

{{Roman Emperors Ancient Roman military personnel who died by suicide Suicides by hanging in France Imperial Roman consuls 353 deaths Year of birth unknown Flavii Caesars (heirs apparent)