Who has defeated Poseidon?

Poseidon, the Greek god of the sea, was notably defeated by Athena in their contest for the patronage of Athens. During this competition, Poseidon struck the ground with his trident, creating a saltwater spring, while Athena offered an olive tree. The citizens chose Athena's gift as more beneficial, leading to her victory and Poseidon's defeat in that context. Additionally, in various myths, heroes like Odysseus manage to outsmart or evade Poseidon, but he is rarely defeated in a traditional sense.