Poseidon’s origin story begins with his birth to the Titans Cronus and Rhea, making him a brother to Zeus, Hades, Hera, Demeter, and Hestia. He was swallowed at birth by his father Cronus, who feared being overthrown by his own children, and later freed when Zeus forced Cronus to disgorge his siblings. This foundational myth establishes Poseidon as one of the three great sons of Cronus, who drew lots to divide the cosmos after the Titanomachy, with Poseidon receiving the sea.
Birth and the Swallowing by Cronus
According to Hesiod’s Theogony (c. 700 BCE), the most authoritative early source for Greek cosmogony, Cronus married his sister Rhea and fathered Hestia, Demeter, Hera, Hades, and Poseidon. However, Cronus had learned from his parents, Gaia (Earth) and Uranus (Sky), that one of his own children would dethrone him, just as he had dethroned his father. To prevent this, he swallowed each child as soon as Rhea gave birth. Poseidon was thus swallowed like his siblings, and Rhea, desperate to save her youngest child Zeus, tricked Cronus into swallowing a stone wrapped in swaddling clothes instead.
After Zeus grew to adulthood in secret on Crete, he returned to challenge Cronus. With the help of the goddess Metis, Zeus administered a potion that made Cronus vomit up his children in reverse order: first the stone, then Poseidon, Hades, and the others. The liberated siblings, along with the Hecatoncheires and Cyclopes whom Zeus freed from Tartarus, fought the Titans in a ten-year war called the Titanomachy. The Cyclopes, in gratitude, forged Zeus’s thunderbolt, Hades’s helmet of invisibility, and Poseidon’s trident, the weapon that would become his signature attribute.
The Division of the Cosmos
After the Olympians defeated the Titans, the three brothers—Zeus, Poseidon, and Hades—drew lots to divide the world into three realms. Zeus received the sky, Hades received the underworld, and Poseidon received the sea. The earth and Mount Olympus were considered common ground, shared by all the gods. This division is described in Homer’s Iliad (Book 15), where Poseidon himself recounts the arrangement: “When we cast lots, I received the grey sea as my abode for all time.”
This story explains why Poseidon is specifically the god of the sea, rather than a more general earth deity. However, Poseidon was also associated with earthquakes and horses, earning him the epithets Enosichthon (Earth-Shaker) and Hippios (of Horses). His connection to horses likely stems from his role as a god of springs and fresh water, which were vital for horse breeding in arid Greece. In some myths, such as the contest for Athens, Poseidon created a spring (or a horse, in some versions) by striking the ground with his trident, but he lost to Athena, who offered the olive tree.
Poseidon in Homer and Hesiod
Homer’s Odyssey portrays Poseidon as a powerful and vengeful deity who holds a grudge against Odysseus for blinding his son, the Cyclops Polyphemus. This wrath drives the entire plot of the epic, as Poseidon repeatedly sends storms to prevent Odysseus from returning home to Ithaca. In the Iliad, Poseidon supports the Greeks against the Trojans, but he also clashes with Zeus over the course of the war, showing his independent and sometimes rebellious nature.
Hesiod’s Theogony provides a more genealogical account, listing Poseidon’s consorts and offspring. His primary wife was Amphitrite, a Nereid (sea nymph), with whom he had Triton, a merman who blew a conch shell to calm or raise the waves. Poseidon also fathered many other children with various goddesses, nymphs, and mortals, including the hero Theseus (with Aethra), the giant Polyphemus (with the nymph Thoosa), and the winged horse Pegasus (with Medusa, after her transformation). The Theogony also mentions that Poseidon and Medusa’s union produced Chrysaor, a giant wielding a golden sword.
Key Myths and Epithets
Poseidon appears in several major myths beyond his origin. One of the most famous is his contest with Athena for the patronage of Athens. Both gods offered gifts to the city: Poseidon struck the Acropolis with his trident, producing a saltwater spring, while Athena planted an olive tree. The Athenians, led by their king Cecrops, judged Athena’s gift more useful, and she became the city’s patron. This myth is depicted on the west pediment of the Parthenon and was a central civic legend for Athens.
Another significant myth involves Poseidon’s role in the Trojan War. He and Apollo were forced by Zeus to serve the mortal king Laomedon of Troy, for whom they built the city’s walls. When Laomedon refused to pay them, Poseidon sent a sea monster to ravage the land, which was later slain by Heracles. This backstory explains Poseidon’s hostility toward Troy during the war, despite his general support for the Greeks.
Poseidon’s epithets reflect his domains and attributes:
- Enosichthon (Earth-Shaker) – emphasizing his power over earthquakes.
- Hippios (of Horses) – linking him to horses and horse racing.
- Pelagios (of the Open Sea) – as a god of the deep ocean.
- Asphaleios (Securer) – as a protector of harbors and safe navigation.
Worship and Cult Sites
Poseidon was widely worshipped across the Greek world, with major sanctuaries at Isthmia (near Corinth), where the Isthmian Games were held in his honor every two years, and at Cape Sounion, where a temple still stands overlooking the Aegean Sea. Sailors and fishermen offered sacrifices to him for safe voyages, and his priests often held significant political power in coastal cities. The Isthmian Games, second only to the Olympic Games in prestige, featured athletic and equestrian competitions, reflecting Poseidon’s connection to horses.
In addition to these Panhellenic sites, Poseidon had local cults throughout Greece and its colonies. In the city of Troezen, he was worshipped as the father of Theseus, and in the island of Rhodes, he was honored as a chief deity. The Romans identified Poseidon with their god Neptune, who was originally a freshwater deity but later absorbed Poseidon’s marine attributes.
Poseidon in Art and Literature
In ancient Greek art, Poseidon is typically depicted as a mature, bearded man holding a trident, often accompanied by dolphins, fish, or sea creatures. He is sometimes shown riding a chariot drawn by hippocamps (sea-horses) or other mythical sea-beasts. The famous bronze statue of Poseidon (or perhaps Zeus) found off Cape Artemision, dating to around 460 BCE, captures his powerful stance with arm raised to hurl a trident or thunderbolt.
In literature, Poseidon appears in many works beyond Homer and Hesiod. The playwright Euripides opens his tragedy Trojan Women with Poseidon lamenting the fall of Troy, a scene that emphasizes his ambivalent role as both a builder of the city’s walls and an enemy of its people. Later writers, such as the Roman poet Ovid in his Metamorphoses, retell Poseidon/Neptune’s myths, including his pursuit of the nymph Caenis, whom he transformed into a male warrior after violating her.
Frequently Asked Questions
Who were Poseidon’s parents?
Poseidon’s parents were the Titans Cronus and Rhea, making him a second-generation Olympian. His siblings were Zeus, Hades, Hera, Demeter, and Hestia. This lineage is consistent across all major sources, including Hesiod and Homer.
Why is Poseidon called the Earth-Shaker?
Poseidon was called Enosichthon (Earth-Shaker) because he was believed to cause earthquakes by striking the ground with his trident. This power was part of his domain over the sea, as earthquakes in ancient Greece were often associated with the sea and coastal regions. He could also create springs and horses by striking the earth.
What is the difference between Poseidon and Neptune?
Poseidon is the Greek god of the sea, earthquakes, and horses, while Neptune is his Roman counterpart. The Romans originally had a minor freshwater god named Neptune, but they merged him with Poseidon after adopting Greek mythology, giving Neptune the same attributes, myths, and iconography, including the trident.
Did Poseidon have any famous children?
Yes, Poseidon fathered many notable children, including the hero Theseus (king of Athens), the Cyclops Polyphemus (who appears in the Odyssey), the winged horse Pegasus and the giant Chrysaor (both from Medusa), and the sea god Triton (with his wife Amphitrite). He also had many other offspring, such as the hunter Orion and the king Pelias.
Why did Poseidon lose the contest for Athens?
In the contest for Athens, Poseidon offered a saltwater spring (or a horse, in some versions) by striking the Acropolis with his trident, while Athena offered an olive tree. The Athenians judged the olive tree more useful because it provided food, oil, and wood, whereas the saltwater spring was not potable. Athena thus became the city’s patron, and Poseidon’s anger was said to have caused the city’s later flooding.
What were Poseidon’s symbols?
Poseidon’s primary symbols were the trident, the horse, the bull, and the dolphin. He was often depicted with a trident, which he used to control the sea and cause storms or earthquakes. Horses were sacred to him, and he was credited with creating the first horse, while bulls and dolphins also appear in his myths and art.
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