Vetranio meets Constantius II at Naissus (Serbia) and is forced to abdicate his imperial title. Constantius allows him to live as a private citizen on a state pension.

Vetranio was briefly an imperial usurper and emperor in the Roman Empire in 350, during which time he controlled Illyricum between the rival emperors Magnus Magnentius and Constantius II, eventually capitulating to the latter.

Constantius II 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 civil wars, court intrigues, and usurpations. His religious policies inflamed domestic conflicts that would continue after his death.

Niš, less often spelled in English as Nish, is the third largest city in Serbia and the administrative center of the Nišava District. It is located in the southern part of Serbia. According to the 2022 census, the city proper has a population of 178,976, while its administrative area has a population of 249,501 inhabitants.