This Roman denarius depicts Neptune, the god of the sea, recognizable by a trident over his shoulder. The reverse shows a little winged cupid riding on a dolphin.
The coin was minted in 76 BC in preparation of the war that the Romans fought against the pirates of the Mediterranean between 74 and 67 BC. This is what the design alludes to. The dolphin was in Antiquity a symbol for a ship's save arrival in the harbor. Cupid on the other hand, the Roman Amor, was in Greek mythology the son of Aphrodite, who again was the mother of Aeneas and with that the ancestor of the Roman people. The coin image thus meant: Neptune grants Aphrodite's descendants a save journey over his sea.