Athena, they were rivals ever since they fought over Athens...I think you can tell who won from the name of the city.
Demeter was the Greek goddess of the harvest, so she was the goddess who gave fertility to the grounds, (along with Poseidon) and she also was in charge of the changing seasons.
Poseidon is the god of earthquakes. No goddess has this responsibility.
She was the daughter of Kronos and Rhea, along with her sisters Hera and Hestia and her brothers Zeus, Poseidon and Hades.
Athena is not one of the Elder Three gods, Zeus, Hades, and Poseidon, but she is one of the Twelve Olympians. By the way, Athena is a goddess, not a god.
The goddess Athena
Annabeth explains that Poseidon and Athena do not get along due to a rivalry over Athens, as they both wanted to be the city's patron god or goddess. Additionally, their differing domains - Poseidon being the god of the sea and Athena being the goddess of wisdom and war - also contribute to their discord. Their competitive natures and conflicting personalities further fuel their animosity towards each other.
Poseidon is King of the Sea. No god or goddess ruled him in his domain.
if this is what ur asking poseidon's wife amphitrite queen of the sea.
There is an older god of the sea: Nereus, who was replaced by the Olympian god, Poseidon. So there is no goddess of the sea. Amphitrite is the wife of Poseidon. She is then the sea goddess.
Amphitrite was the goddess of the sea, married to Poseidon, god of the sea
Poseidon
Poseidon