Russell Robinson, who further sub-divided this main type into the two sub-types of 'Imperial Gallic' and 'Imperial Italic'.
The term Imperial helmet was coined by H. This constituted the final evolutionary stage of the legionary helmet ( galea). So when the improved Imperial helmet appeared, it replaced what remained of the very old Coolus type, which was largely superseded at the time by improved versions of the Montefortino helmet type, which continued to serve alongside it for a time. Even as the professional Imperial army emerged, and short-term service citizen soldiers became rare, useful equipment was never discarded. Thus, a variety of equipment, from different eras was present in the ranks. Prior to the Empire, Roman Republican soldiers often provided their own equipment, which was passed down from father to son. The Imperial helmet-type was a type of helmet worn by Roman legionaries.
