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Poseidon

Poseidon (Greek: Ποσειδῶν): ancient Greek god of the sea, horses, and earthquakes. Adopting Greek mythology, the Romans identified him with Neptune.

Poseidon

Melos, Statue of Poseidon

Perhaps an Indo-European deity (*pótis + dâwon, "ruler" + "waters"; "lord of the sea"??)
Venerated in Mycenaean times (Po-se-da-o)
Sanctuaries: Athens, Corinth, Isthmia, Onchestus, Poseidonia (= Paestum), Sounion
His attribute: the trident
Various names: Gaieochos ("earth-shaker"), Helikonios ("of the Helicon"), Hippios ("the horseman")
An Athenian myth focused on an ancient rivalry between Poseidon and Athena: who was to give his or her name to the new city? Poseidon tried to bribe the citizens by offering them a horse; Athena gave them the olive tree, and won the contest.

Corinth, Small painting of Poseidon

Eleusis, Statue of Poseidon

Statuette of Poseidon

Poseidon on a coin of Demetrius Poliorcetes

Neptune

When the Romans adopted Greek mythology, they identified their Neptune with the Greek Poseidon
In Rome, there was a basilica of Neptune in the Baths of Agrippa
Protector of X Fretensis, XI Claudia, and XXX Ulpia Victrix

Byblos, Statue of Poseidon

Sagalassus, Poseidon

Sirmium, Relief of Neptune

Ostia, Baths of Neptune, Mosaic with Neptune