Coolus helmet

[4] Within a long process of evolution, Roman military armor for the head developed from early pre-Roman helmets.

Rome itself had no proper tradition of such objects, as most of the soldiers of the Early Republic made use of helmets produced by the Etruscans, whose craftsmen were known for their ability to make vessels.

[6] Another common feature was a turned or cast soldered- or riveted-on crest knob.

[7] The Coolus helmet has become a well known and recognizable part of historical warfare.

The Coolus was replaced by the Imperial helmet type, a more developed form also derived from a Celtic original.