The cognomen of this legion came from Herculius, the attribute of Maximian (Diocletian's colleague) meaning "similar to Hercules".
VI ''Herculia'' | 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 |