There are published several examples of a bronze medallion of Antoninus Pius, dated A.D. 140–144, with the following reverse (fig 33):
AESCVLAPIVS in exergue.
Ship to right under arched structure; one man is visible on ship; at prow, serpent springing to right; to right, river-god facing left with right hand extended in greeting; above him, indications of rocks; above them, three buildings and a tree.
The casual observer would naturally interpret the scene as follows : “From under a bridge comes a ship in motion, from the prow of which a serpent leaps to the land; a river-god greets him; the inscription AESCVLAPIVS identifies the scene as the arrival of the sacred snake of Aesculapius at the Insula Tiberina, the Insula Tiberina being represented to the right, and a bridge across the Tiber (Pons Aemilius?) to the left; the river-god being the Tiber.”