Neptune was the god of freshwater and the sea in Roman religion.

Residence: Sea
Symbols: Trident, horse, dolphin, bull
Parents: Saturn and Ops
Siblings: Ceres, Juno, Jupiter, Pluto, Vesta
Consort: Salacia
Children: Triton
Greek equivalent: Poseidon
Festivals: Neptunalia
Other Names: Neptune Equestris

Sousse neptune.jpg
Neptune in his chariot, mid-3rd c. AD, Sousse Archaeological Museum.

From early on Neptune had been equated with Poseidon, but was primarily a god of springs, lakes and rivers before becoming also a god of the sea.

Mosaic of Neptune. Regional Archeological Museum Antonio Salinas, Palermo.