Pietas, draped, standing left, sacrificing over altar.
Reverse script
Latin
Reverse lettering
P M TR
P IIII COS II P P (Translation: Pontifex Maximus, Tribunicia Potestate Quarta, Consul Secundum, Pater Patriae. High priest, holder of tribunician power for the fourth time, consul for the second time, father of the nation.)