cap by long earflaps or a long neck flap. Also confusingly similar are the depictions of the helmets used by cavalry and light infantry (cf. Peltasts of Thrace and Paeonia), whose headgear – aside from the traditional alopekis caps of fox skin – also included stiff leather helmets in imitation of the bronze ones. In the Roman world The Greek concept passed to the Romans in its extended sense, and thus encompassed not only to Phrygians or Trojans (which the Romans also generally associated with the term "Phrygian"), but also the other near-neighbours of the Greeks. On Trajan's Column, which commemorated Trajan's epic wars with the Dacians (101–102 and 105–106 CE), the Phrygian cap adorns the heads of Dacian warriors. The prisoner, accompanying Trajan in the monumental, three meter tall statue of Trajan in the ancient city of Laodicea, is wearing a Phrygian cap. Parthians appear with Phrygian caps in the 2nd-century Arch of Septimius Severus, which commemorates Roman victories over the Parthian Empire. Likewise with Phrygians caps, but for Gauls, appear in 2nd-century friezes built into the 4th-century Arch of Constantine. The Phrygian cap reappears in figures related to the first to fourth century religion of Mithraism. This astrology-centric Roman mystery cult (cultus) projected itself with pseudo-Oriental trappings (known as perserie in scholarship) in order to distinguish itself from both traditional Roman religion and from the other mystery cults. In the artwork of the cult (e.g. in the so-called "tauroctony" cult images), the figures of the god Mithras as well as those of his helpers Cautes and Cautopates are routinely depicted with a Phrygian cap. The function of the Phrygian cap in the cult are unknown, but it is conventionally identified as an accessory of its perserie. Early Christian art (and continuing well into the Middle Ages) build on the same Greco-Roman perceptions of (Pseudo-)Zoroaster and his "Magi" as experts in the arts of astrology and magic, and routinely depict the "three wise men" (that follow a star) with Phrygian caps. As a symbol of liberty From Phrygian to liberty cap In late Republican Rome, a soft felt cap called the pileus served as a symbol of freemen (i.e. non-slaves), and was symbolically given to slaves upon manumission, thereby granting them not only their personal liberty, but also libertas – freedom as citizens, with the right to vote (if male). Following the assassination of Julius Caesar in 44 BC,