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Poseidon

Wikipedia

Mythology for Middle School Readers

Poseidon was one of the Twelve Olympians in ancient Greek religion and myth, god of the sea, storms, earthquakes and horses. In pre-Olympian Bronze Age Greece, he was venerated as a chief deity at Pylos and Thebes. His Roman equivalent is Neptune.
Poseidon was protector of seafarers, and of many Hellenic cities and colonies. In Homer's Iliad, Poseidon supports the Greeks against the Trojans during the Trojan War and in the Odyssey, during the sea-voyage from Troy back home to Ithaca, the Greek hero Odysseus provokes Poseidon's fury by blinding his son, the Cyclops Polyphemus, resulting in Poseidon punishing him with storms, the complete loss of his ship and companions, and a ten-year delay. In Plato's Timaeus and Critias, the island of Atlantis was Poseidon's domain.
Poseidon was the second son of the Titans Cronus and Rhea. In most accounts he is swallowed by Cronus at birth and is later saved, along with his other brothers and sisters, by Zeus. However, in some versions of the story, he, like his brother Zeus, did not share the fate of his other brother and sisters who were eaten by Cronus. He was saved by his mother Rhea, who concealed him among a flock of lambs and pretended to have given birth to a colt, which she gave to Cronus to devour.
According to a single reference in the Iliad, when the world was divided by lot in three, Zeus received the sky, Hades the underworld and Poseidon the sea. In Homer's Odyssey, Poseidon has a home in Aegae.
Poseidon and Apollo, having offended Zeus by their rebellion in Hera's scheme, were temporarily stripped of their divine authority and sent to serve King Laomedon of Troy. He had them build huge walls around the city and promised to reward them well, a promise he then refused to fulfill. In vengeance, before the Trojan War, Poseidon sent a sea monster to attack Troy. The monster was later killed by Heracles.
Poseidon was said to have had many lovers of both sexes. His consort was Amphitrite, a nymph and ancient sea-goddess, daughter of Nereus and Doris. Together they had a son named Triton, a merman.
Poseidon was the father of many heroes. He is thought to have fathered the famed Theseus. A mortal woman named Cleito once lived on an isolated island; Poseidon fell in love with the human mortal and created a dwelling sanctuary at the top of a hill near the middle of the island and surrounded the dwelling with rings of water and land to protect her. She gave birth to five sets of twin boys; the firstborn, Atlas, became the first ruler of Atlantis.