Poseidon was the Greek god of the sea, earthquakes, and horses. He was one of the most powerful Olympian deities and the brother of Zeus, Hades, Hera, Demeter, and Hestia. After the Titanomachy, Poseidon claimed dominion over the seas, while Zeus ruled the sky and Hades ruled the underworld.
Poseidon was often depicted wielding his powerful trident, a three-pronged weapon that could stir the seas, create storms, and even shatter the earth itself. Known for his volatile temper, Poseidon’s moods were believed to directly influence the state of the oceans — calm when pleased, but turbulent and destructive when angered.
One of Poseidon's most famous myths involves his rivalry with Athena for the patronage of Athens. In this contest, Poseidon struck the earth with his trident, producing a saltwater spring, while Athena gifted the city an olive tree. The Athenians favored Athena’s gift, securing her patronage, which left Poseidon bitter.
Poseidon was also known for his many offspring, including notable figures like the giant Polyphemus, the hero Theseus, and the winged horse Pegasus, born from the blood of Medusa.
In addition to his role as the god of the seas, Poseidon was called the “Earth-Shaker” for his power to cause earthquakes. Sailors often prayed to him for safe passage, while coastal cities built temples in his honor to appease his unpredictable nature.
Poseidon’s complex character — both protective and destructive — made him one of the most formidable and respected gods in Greek mythology.