Quintus Atius Labienus, son of Titus Labienus (Caesar's legate in Gaul), served under Cassius Longinus during the civil war. Quintus Labienus was sent as ambassador to secure Parthian support against Antony and Octavian. Eventually Labienus joined forces with the Parthians and invaded Spain in 40 BC. After he had defeated the Roman army at Apamea, he captured Antioch, killed Saxa at Cilicia and invaded the greater part of Asia Minor. During a counter-attack in 39 BC Labienus was killed and the Roman forces recaptured Asia Minor.

While he was allied with the Parthians against imperial forces, a mint travelling with Labienus struck coins bearing the obverse legend Q. LABIENVS PARTICVS IMP - the title Parthicus indicates Labienus' position as a Parthian ally. These coins were used to pay his soldiers.

Obv. Labienus facing right, Q. LABIENVS PARTICVS IMP. The portrait is typical Roman and shows the lean and severe features of a military man.
Rev. A very skillful depiction of a Parthian horse with a bridle and saddle, bow case and quiver attached to saddle. It pays hommage to the famous Parthian cavalry.