The Phrygian cap is a soft conical cap with the top pulled forward, associated in antiquity with several peoples in Eastern Europe and Anatolia, including Phrygia, Dacia and the Balkans. In early modern Europe it came to signify freedom and the pursuit of liberty through a confusion with the pileus, the felt cap of manumitted (emancipated) slaves of ancient Rome. Accordingly, the Phrygian cap is sometimes called a liberty cap; in artistic representations it signifies freedom and the pursuit of liberty.
It is used in the coat of arms of certain Republics or of republican State institutions in the place where otherwise a Crown would be used (in the heraldry of monarchies). It thus came to be identified as a symbol of the republican form of government.
By the 4th century BC (early Hellenistic period) the Phrygian cap was associated with Phrygian Attis, the consort of Cybele, the cult of which had by then become graecified. At around the same time, the cap appears in depictions of the legendary king Midas and other Phrygians in Greek vase-paintings and sculpture. Such images predate the earliest surviving literary references to the cap.
By extension, the Phrygian cap came to be applied to several other non-Greek-speaking peoples ("barbarians" in the classical sense) as well. Most notable of these extended senses of "Phrygian" were the Trojans and other western Anatolian peoples, who in Greek perception were synonymous with the Phrygians, and whose heroes Paris, Aeneas, and Ganymede were all regularly depicted with a Phrygian cap. Other Greek earthenware of antiquity also depict Amazons and so-called "Scythian" archers with Phrygian caps. Although these are military depictions, the headgear is distinguished from "Phrygian helmets" by long ear flaps, and the figures are also identified as "barbarians" by their trousers. The headgear also appears in 2nd-century BC Boeotian Tanagra figurines of an effeminate Eros, and in various 1st-century BC statuary of the Commagene, in eastern Anatolia. Greek representations of Thracians also regularly appear with Phrygian caps, most notably Bendis, the Thracian goddess of the moon and the hunt, and Orpheus, a legendary Thracian poet and musician.