Which term refers to a helmet with a crest worn by soldiers?

The term that refers to a helmet with a crest worn by soldiers is "galea." In ancient Roman military attire, the galea was typically made of metal or sturdy materials and often featured an ornate crest that could be decorated with feathers or horsehair, serving both as a functional piece of armor and a symbol of rank and identity on the battlefield.

The design of the galea not only provided protection for the head but also helped distinguish different ranks and units among soldiers. It was a significant element of a soldier's gear, particularly in the Roman army, where such details conveyed important information about the soldier's role and status.

The other terms provided do not specifically denote a helmet with a crest in the same context. "Casque" generally refers to a type of helmet but lacks the specific military connotation of a crest. "Coronet" typically denotes a small crown or ornamental headpiece, rather than a military helmet. "Phrygian" refers to a type of hat associated with freedom, particularly in artistic representations, rather than denoting a crested helmet. Thus, "galea" is the most accurate term in this context.