Caracalla, Rome mint,
Denarius (18-19 mm / 3.54 g), 201 AD.,
Obv.: ANTONINVS - PIVS AVG , laureate, cuirassed and draped bust of the young Caracalla right, seen from behind.
Rev.: PART MAX PONT TR P IIII , Trophy between two seated captives wearing oriental costume (two Persians bound and seated back to back at base of trophy).
RIC 54a ; Hill 529 ; C. 175 ; BMC 264 .
The reverse refers to the victories achieved over Parthia in ca. 198 AD and secured by he treaty of 199 AD.
(he looks like an unhappy little boy, thinking about how to satisfy his thirst for revenge, maybe Geta had just damaged his favourite toy?)