p293 Galerius advanced into Media and Adiabene , winning victories , particularly near Erzurum , p151 and securing Nisibis ( Nusaybin , Turkey ) before 1 October 298 . Galerius advanced into Media and Adiabene , winning continuous victories , most prominently near Erzurum , and securing Nisibis ( Nusaybin , Turkey ) before October 1 , 298 .