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Poseidon and Zeus are recorded as siblings within the Greek Pantheon.
Greek Pantheon
tradition
Greek Pantheon
sea, earthquakes, horses, storms
domains
sky, thunder, lightning, law, order
trident, horse, dolphin, bull
symbols
thunderbolt, eagle, oak tree, bull
Neptune
also called
Jupiter, Jove
Poseidon alone
sea, earthquakes, horses, storms
Zeus alone
sky, thunder, lightning, law, order
Poseidon
Cult sites: Sanctuary of Poseidon at Isthmia, Temple of Poseidon at Sounion, Onchestos in Boeotia.
Festivals: Isthmian Games, Posideia.
Horses, earthquakes, and the drowned coast are his working signs. Isthmia held games under his name. A bull often went to the sea. Inland Boeotia kept him as a horse god, not only a sailor's patron.
Zeus
Cult sites: Temple of Zeus at Olympia, Oracle of Zeus at Dodona, Nemean sanctuary.
Festivals: Olympic Games, Diasia, Dipolieia.
White bulls and the thunderbolt belong to him. Olympic contest was a sacrifice as much as a race. Dodona spoke through oak and doves. Civic oaths called Zeus Horkios; a perjurer feared the sky more than the court.
Greek Pantheon
God of the sea, earthquakes, and horses. Brother of Zeus and Hades, ruler of the oceans and all waters.
Poseidon rules the vast oceans, earthquakes ("Earth-Shaker"), and horses. He is a moody and tempestuous god, much like the sea itself. Sailors prayed to him for safe passage, often sacrificing horses or bulls to appease his wrath.
Read the full Poseidon entryGreek Pantheon
King of the gods and ruler of Mount Olympus. God of the sky, thunder, and justice. Zeus overthrew his father Cronus to become the supreme deity of the Greek pantheon.
Zeus was the youngest son of the Titans Cronus and Rhea. Cronus, fearing a prophecy that he would be overthrown by his children, swallowed each child at birth. Rhea hid Zeus and gave Cronus a stone wrapped in swaddling clothes instead. Zeus was raised in secret and later forced Cronus to regurgitate his siblings, leading the rebellion against the Titans.
Zeus is the supreme ruler of the gods, the lord of the sky, and the wielder of the thunderbolt. His power is greater than that of all the other gods combined. He presides over the oaths of men and the laws of the universe, ensuring justice and order.
Read the full Zeus entry