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Poseidon was the god of the sea and earthquakes in Greek mythology, (TV: Planet of Fire) also known as King Neptune, (COMIC: Guests of King Neptune) the name given to him by the Romans. (PROSE: Byzantium!) He was a son of the titan Kronos, whom he succeeded as the god of Atlantis. (TV: The Time Monster)
Though many accounts depicted the Olympian gods as real beings, they disagreed on the details. By one source, Olympus was a planet on which they all resided. When Prometheus returned after escaping his imprisonment, he asked Aphrodite whether Poseidon still lived, and she replied that he did. (COMIC: The Life Bringer!) According to another, the Immortals originated in another dimension. (PROSE: Deadly Reunion) Yet another account showed the First Doctor encountering Neptune in a castle made of sand located on a South Seas island on Earth, alongside his mermaid servants. After sending a wave to move the First Doctor, John and Gillian out of the way of a volcanic eruption, he gave them a great feast. Before they left, he gave a pearl necklace to Gillian and a golden shell to John. (COMIC: Guests of King Neptune) Additionally, one account showed that versions of Poseidon and the other Olympians existed in the Land of Fiction. (AUDIO: The Wrath of Medusa)
The Temple of Poseidon was built in Atlantis, where an image of the god was enthroned. The Atlanteans called Poseidon the King of the Ten Kings. The temple was destroyed by Kronos 527 years later, along with the rest of the city. (TV: The Time Monster)
Romans adopted Poseidon into their pantheon under the name of Neptune. (PROSE: Byzantium!)
Besides Zeus, he was the only one with power equivalent to Hades. Hermes impersonated him long enough for Persephone to summon the real one. Poseidon then expelled Hades from Earth, sending him back to the Underworld. (PROSE: Deadly Reunion)
In some versions of the Medusa story, she wasn't always ugly. She was a beautiful nymph with golden hair. When Poseidon fell in love with Medusa, Athena became jealous and turned her into a Gorgon. (TV: Eye of the Gorgon)
After the end of the universe, when all of humanity was resurrected in the City of the Saved, the Romans revised their pantheon. Neptunus was demoted, as the City's seas - though large enough to quench suns - were dwarfed by its land and architecture, and none of them bordered the Romuline. Instead, Neptunus became a minor god patronising horses and fishmongers; he and Dis Pater were replaced as major gods by Romulus and Civitata. (PROSE: Of the City of the Saved...)
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Neptunium was named after Neptune. (PROSE: Elementary, My Dear Sheila)