Magnus Decentius (d. 18 August353) was a Roman usurper against Roman EmperorConstantius II. August 18 is the 230th day of the year (231st in leap years) in the Gregorian calendar. ... Events Battle of Mons Seleucus - Constantius II defeats the usurper Magnentius. ... Usurpers were a common feature of the late Roman Empire, especially from the so-called crisis of the third century onwards, when political instability became the rule. ... Roman Emperor is the term historians use to refer to rulers of the Roman Empire, after the epoch conventionally named the Roman Republic. ... Constantius II coin, celebrating the 15th year of reign. ...
Probably brother of Magnentius, Decentius was made Caesar by him in winter 350/351, and was consul in 352 and 353. When Magnentius was defeated by Constantius at the Battle of Mons Seleucus and suicided, Decentius, who was leading reenfocement, hanged at Senonae. Magnentius (ruled AD January 18, 350–August 11, 353), was a Roman usurper. ... Caesar (p. ... Events January 18 - Magnentius proclaimed Emperor by the army in Autun. ... Events March 15 - Constantius II elevates his cousin Gallus to Caesar, or assistant emperor, and is put in charge of the Western Roman Empire. ... The List of Roman Consuls from the Death of Commodus 193 Q. Pompeius Sosius Falco, C. Iulius Erucius Clarus Vibianus 194 Imp. ... Events Liberius becomes Pope Earliest sighting of a supernova occurs in China Births Deaths Pope Julius I. Bishop Nicholas of Myra, Roman priest (or 345). ... The Battle of Mons Seleucus was fought in 353 between the forces of Constantius II and the forces of the usurper Magnentius. ...
References
DiMaio, Michael, "Magnentius (350-353 A.D) and Decentius (351-353 A.D.)", De Imperatoribus Romanis site
Probably in the winter of 350/1, Magnentius acclaimed Magnus Decentius, perhaps the usurper's brother, Caesar to protect Gaul and the Rhine line.
[[5]] In less then a week, on 18 August, Decentius, his Caesar, on his way to aid him, hanged himself at Senonae when he received the news of Magnentius' death.
"Magnus Decentius 3" the Prosopography of the Later Roman Empire, Cambridge, 1971, 1.244ff.
The use of the present tense in describing the signification of the rite implies the contrary, and independent evidence is clearly against the supposition.
There remains to be noticed under this head the most celebrated of all patristic testimonies on extreme unction, the well-known passage in the Letter of Pope Innocent I (402-417), written in 416, to Decentius, Bishop of Eugubium, in reply to certain questions submitted by the latter for solution.
It is worth adding, as a conclusion to our survey of this period, that Innocent's reply to Decentius was incorporated in various early collections of canon law, some of which, as for instance that of Dionysius Exiguus (P.L., LXVII, 240), were made towards the end of the fifth or the beginning of the sixth century.