The Battle of Mursa Major was fought in AD 351 between the eastern Roman armies led by Constantius II and the western forces supporting the usurper Magnentius.
The site may have been leveled around AD 350 possibly because of its owner's support for the usurper emperor Magnentius.
However, the short-lived revolt of Nepotianus, a member of the Constantinian dynasty, showed Magnentius that his status of Emperor was to be consolidated against the members of that dynasty.
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The most notorious agent in this search was the primicerius notariorum Paulus Catena.
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This revolt had a loyalist mark, since Vetranio was supported by Constantina, and Constantius II himself recognized Vetranio, sending him the imperial diadem.
After this inconclusive mission, one of Magnentius' commanders, the Frankish Claudius Silvanus, and most of his men deserted to Constantius, thus helping seal the outcome.
In late summer 351 he was in Sirmium, member of the tribunal processing Photinus; the city was under control of the area under control of Emperor Constantius II, while Rome was occupied by usurper Magnentius.