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 AD), the Phrygian cap adorns the heads of Trajan's Dacian prisoners. The prisoner, accompanying Trajan in the monumental, 3 m tall statue of Trajan in the ancient Turkish 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.