In Greek mythology, Poseidon and Zeus were brothers (the children of Cronus and Rhea) and two of the Twelve Olympians, the principal gods of the Greek pantheon, residing atop Mount Olympus.

According to a single reference in the Iliad, when the world was divided in three by a draw of lots, Zeus received the sky and air, and Poseidon received the sea. Their sibling Hades received the underworld.

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Poseidon versus Zeus comparison chart
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Introduction (from Wikipedia) In Greek mythology, Poseidon [Pro.( /puh-sy'-duhn/)] is the god of the sea and, as “Earth-Shaker,” of earthquakes. His symbols are the trident, swordfish, dolphin, horse, bull, and pearl shell. In the ancient Greek religion, Zeus is the “Father of Gods and men” who rules the Olympians of Mount Olympus as a father rules the family. He is the god of the sky and thunder.
Abode Seas and oceans King of Mount Olympus & air/sky
Siblings Hades, Demeter, Hestia, Hera, Zeus Hestia, Hades, Hera, Demeter, Poseidon
Parents Cronus and Rhea Cronus and Rhea
Children Theseus, Triton, Polyphemus, Pegasus, Chrysaor, Otos, Ephialtes, Hippothoon, Neleus, Pelias, Merman, Nausithous, Nauplios, Arion, Euadne, Orion, and etc. Ares, Athena, Apollo, Artemis, Aphrodite, Dionysus, Hebe, Hermes, Heracles, Helen of Troy, Hephaestus, Perseus, Minos, the Muses, the Graces
Symbol Trident, swordfish, dolphin, horse. Thunderbolt, eagle.
Consort Amphitrite Hera and various others
The Big 3 (brothers) 2nd oldest Youngest
Origin Poseidon was a son of Cronus and Rhea. In most accounts he is swallowed by Cronus at birth but later saved, with his other brothers and sisters, by Zeus. Like other children of Cronus and Rhea, Cronus wanted to swallow Zeus at birth. But when Rhea gave birth to Zeus in Crete, she handed Cronus a rock wrapped in swaddling clothes, which he promptly swallowed.


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