It depends on what you want to represent. The Greek city states certainly used Thracian mercenaries, but they typically fought with javelins. The Macedonian army of Philip II and Alexander III the Great used Odryssian (Thracian) cavalry, but rhomphaia infantry is not attested. However, the later Antigonids (306–168 BC) certainly deployed them: Thracian mercenaries with black cloak, white thureos, and rhomphaia were one of the elite units of Philip V (r. 221–179 BC), fighting as a vanguard/specia
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