Caracalla, in military attire, on horse galloping right, holding raised spear in hand; before, captive.
Reverse script
Latin
Reverse lettering
PONTIF
TR P XI COS III PROF (Translation: Pontifex [Maximus], Tribunicia Potestate Undecima, Consul Tertium, Profectio [High] priest, holder of tribunician power for the eleventh time, consul for the third time, departure / march-off)