Legio XVIII | Legio XVII | Legio XV Apollinaris | Legio XIX | Legio V ''Iovia'' | Legio V Iovia | Legio VI Herculia | Legio VI Ferrata | Legio II Augusta | legio VI Ferrata | legio III Gallica | Legio XX Valeria Victrix | Legio XIV Gemina | Legio X Equestris | Legio VI ''Ferrata'' | Legio IV Scythica | Legio II ''Augusta'' | Legio I Adiutrix |
Thus Diocletian, who ruled from Nicomedia, promoted two faithful legions from the Illyricum (Legio V Iovia and VI Herculia), the area he was also descended from, to be the personal protectors of the Roman Emperors.