Marcus Aurelius AR denarius. Struck AD 166.

M ANTONINVS AVG ARM PARTH MAX, laureate head right.
TR P XX IMP IIII COS III around, PAX below, Pax standing left, holding olive branch and cornucopiae. 

RIC III, 164; RSC 880.

Image courtesy of the Museu Arqueològic de Llíria, inv. no. 38663.