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The Roman god Neptune
Neptune (Greek equivalent: Poseidon) was the god of the sea, of earthquakes and of horses. Possibly reflecting Rome's comparatively late arrival as a commercial and military power on the seas, the cult of Neptune was one of the later arrivals at Rome. Neptune's importance was perhaps most obvious in art, especially mosaics of the Imperial period (31 BC - AD 476), where scenes of marine life, a common theme, often show Neptune and his entourage. In art he usually appears as a bearded, powerfully-built man in the prime of life. He is difficult to distinguish from his brother Jupiter, except that he characteristically carries a three-pronged trident.