Caracalla AE Sestertius, 214 AD, Rome.

M AVREL ANTONINVS PIVS FELIX AVG, laureate, draped, cuirassed bust right.
P M TR P XVII IMP III COS IIII P P S C, Caracalla on horseback right, 
brandishing spear at fallen foe, sitting before horse.

RIC 526a (type 2).

With kind permission of Numismatica Ars Classica, 2009