Poseidon had many, many sons, from many, many different partners. Some of them are Triton (his only legitimate son), born of his wife and queen, Amphitrite. Other sons include Leneus, Antuelus, and Polyphemus, the cyclops Odysseus blinded.
the function of Poseidons temple was for Poseidons honor.
Rhea.
cronus
Cronus and Rhea
Triton
Neptune
Rhea.
a trident
He doesn't had friends
In myths, he does not have one.
The sea, particularly the Mediterranean.
Swimming, fishing and women.