For the magister officiorum under Constantius II, see Decentius (magister officiorum).
Usurper of the Roman Empire
Reign 350 – 18 August 353 (as Caesar under Magnentius)
Died 18 August 353(353-08-18)
Full name
Magnus Decentius

Magnus Decentius (died 18 August 353) was a usurper of the Western Roman Empire against emperor Constantius II. American scholar Michael DiMaio speculates that Decentius possibly was the brother of Magnentius, who had revolted against Constantius on 18 January 350.

Magnentius elevated Decentius as Caesar by him that winter, to oversee the defence of Gaul and the Rhine frontier. He was appointed consul ordinarius in 352.

When Magnentius was defeated by Constantius at the Battle of Mons Seleucus and committed suicide, Decentius, who was leading reinforcements, hanged himself at Senonae.


Media related to Decentius at Wikimedia Commons

Preceded by
Imp. Caesar Flavius Magnus Magnentius Augustus,
Post consulatum Sergii et Nigriniani (East)
Consul of the Roman Empire
with Paulus
Imp. Caesar Flavius Iulius Constantius Augustus V
Flavius Claudius Constantius Caesar
Succeeded by
Imp. Caesar Flavius Magnus Magnentius Augustus II,
Magnus Decentius Caesar II,
Imp. Caesar Flavius Iulius Constantius Augustus VI,
Flavius Claudius Constantius Caesar II
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