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.
Contest for Athens
Poseidon competed with Athena for the patronage of Athens. He struck the Acropolis with his trident, creating a salt spring. Athena planted an olive tree. The people chose the olive tree, and Poseidon, enraged, flooded the Thriasian plain.
A God Of Boundaries And Storms
Greek myth uses Poseidon whenever a story crosses unstable ground or dangerous water. He breaks ships, sends monsters, fathers island dynasties, and reminds mortals that civilization depends on forces it cannot fully control. That wider role makes him more than a sea god: he is a divine power behind coastal trade, colonization, horses, and sudden catastrophe.
