 Later on, Constans used it as a temporary residence.According to the Hieronimus' Chronicles, after Vetranio, commander of the Danubian army, had been proclaimed emperor in Sirmium, he surrendered the insignia of imperial power to Constantius II in Naissus, doubtless at the imperial villa, in 350.Julian the Apostate unexpectedly spent some time in Naissus on his expedition against Constantius II, at the end of 361.