 Historical records testify it was in Naissus that he passed several laws – in 315, 319, 324, and 334.After Constantine's death in 337, the imperial residence in Mediana was used by several other emperors, either as a place of rest on their long journeys or during preparations for war.Thus, Constantine's sons, Constantius II and Constans, stayed in Naissus in the winter of 340, for they signed an edict there.