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Antoninus Pius - Roman Emperor: 138-161 A.D.
Bronze As (28mm 10.36 grams) Rome: 140-144 A.D.
Reference: BMC 1370; C. 885; RIC 694(a); Strack 888.
ANTONINVS AVG PIVS P P, Laureate head right.
TR POT COS III / S C, Mars, nude, but for cape over shoulder, holding spear and  shield, descending right through the air to Rhea Silvia, who reclines left, nude  down to hips, asleep on the ground, her head propped by left hand, right hand  over head.