The origin of the name is a mystery but is attributed to its appearance from some angles as looking like a Frenchman's cap, notably the Liberty cap worn during the French Revolution (1789–1799).
For most of the century nasal helmets with a forward deflected apex, often called the 'Phrygian cap' shape, were in widespread use.
At the feet of the Earl is his crest of the head in-profile and shoulders of a bearded oriental man wearing a Phrygian cap with pointed tasselled top flopped over.
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The Portuguese Efígie da República is represented as a young woman wearing the phrygian cap, modeled after the Liberty of Eugène Delacroix' Liberty Leading the People.
The Phrygian cap was typically worn by the inhabitants of Phrygia, in the Anatolian peninsula, and is commonly mistaken for being a Pileus.