'''Neptune''' is the god of freshwater and the sea in the Roman religion. He is the counterpart of the Greek god Poseidon. In the Greek-inspired tradition, he is a brother of Jupiter and Pluto, with whom he presides over the realms of heaven, the earthly world (including the underworld), and the seas. Salacia is his wife.

Neptune’s festival (Neptunalia) took place in the heat of the summer (July 23), when water was scarcest; thus, its purpose was probably the propitiation of the freshwater deity. Neptune had a temple in the Circus Flaminius at Rome; one of its features was a sculptured group of marine deities headed by Poseidon and Thetis. In art Neptune appears as the Greek Poseidon, whose attributes are the trident and the dolphin.

Depictions of Neptune in Roman mosaics, especially those in North Africa, were influenced by Hellenistic conventions. He was likely associated with freshwater springs before the sea. Like Poseidon, he was also worshipped by the Romans as a god of horses, Neptunus equestris, who was also a patron of horse-racing.

The theology of Neptune is limited by his close identification with the Greek god Poseidon, one of many members of the Greek pantheon whose theology was later tied to a Roman deity. The lectisternium of 399 BC indicated that the Greek figures of Poseidon, Artemis, and Heracles had been introduced and worshipped in Rome as Neptune, Diana, and Hercules. It has been speculated that Neptune has been conflated with a Proto-Indo-European freshwater deity; since the Indo-Europeans lived inland and had little direct knowledge of the sea, the Romans may have reused the theology of a previous freshwater god in their worship of Neptune. Servius explicitly names Neptune as the god of rivers, springs, and waters; he may parallel the Irish god Nechtan, master of rivers and wells. This is in contrast to Poseidon, who was primarily a god of the sea.

Neptune has been associated with a number of other Roman deities. By the first century BC, he had supplanted Portunus as the god of naval victories; Sextus Pompeius called himself the "son of Neptune". For a time, Neptune was paired in his dominion of the sea with Salacia, the goddess of saltwater. Neptune was considered the legendary progenitor god of the Falisci (who called themselves Neptunia proles), joining Mars, Janus, Saturn, and Jupiter as the deific father of a Latin tribe.

Neptune is one of only four Roman gods to whom it was considered appropriate to sacrifice a bull. The other three were Apollo, Mars, and Jupiter, although Vulcan has also been depicted with the offering of a red bull and a red-bull calf. If an incorrect offering was presented, either inadvertently or due to necessity, additional propitiation was required to avoid divine retribution. This type of offering implied a stricter connection between the deity and the world.

Paredrae are entities who accompany a god, representing the fundamental aspects (or powers) of that god. With Hellenic influence, these paredrae came to be considered separate deities and consorts of their associated god. Earlier folk belief might have also identified paredrae as consorts of their god.

Salacia and Venilia have been discussed by ancient and modern scholars. Varro connects Salacia to salum (sea), and Venilia to ventus (wind). Festus attributed to Salacia the motion of the sea. Venilia brought waves to the shore, and Salacia caused their retreat out to sea.

Preller, Fowler, Petersmann and Takács attribute to the theology of Neptune broader significance as a god of universal worldly fertility, particularly relevant to agriculture and human reproduction. They interpret Salacia as personifying lust, and Venilia as related to venia: ingratiating attraction, connected with love and the desire for reproduction. Ludwig Preller cited a significant aspect of Venilia; she was recorded in the indigitamenta as a deity of longing or desire. According to Preller, this would explain a theonym similar to that of Venus. Other data seem to agree; Salacia would parallel Thetis as the mother of Achilles, and Venilia would be the mother of Turnus and Iuturna by Daunus (king of the Rutulians). According to another source, Venilia would be the partner of Janus, with whom she mothered the nymph Canens (loved by Picus). These mythical data underline the reproductive function envisaged in the figures of Neptune's paredrae, particularly that of Venilia, in childbirth and motherhood. A legendary king Venulus was remembered at Tibur and Lavinium.

All published appearances of Neptune from before January 1, )-(95)}} are in the public domain in the US.

Some notable appearances are listed below:

* The Fairies and the Christmas Child, by Lilian Gask (1912)

*Nature Boy #3-5
*Whiz Comics #125
*Four Color #8
*Hit Comics #27, 57
*More Fun Comics #10
*Meteor Comics #1
*America's Greatest Comics #5
*Wonder Comics #2
*Humdinger vol. 1 #4
*Mystery Men Comics #24
*Blue Circle Comics #1-5
*Feature Comics #70, 92
*Weird Comics #10
*Master Comics #41
*A Treasury of Horses
*Archie's Madhouse #28

*Neptune Nonsense (1936)

*The 5th Annual Macy's Christmas Parade (1928)

Neptune1.jpg|From Humdinger vol. 1 #4
Neptune2.jpg|From America's Greatest Comics #5

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