His rival is Athena.But probably his enemy is Oceanus, the titan of the sea.
I am not sure really, about all of them!But I know one of them for sure is Poseidon!
Oceanus was a titan, not a god, and he ruled all of the oceans of the world. Later when the titans were defeated, Poseidon took over to rule the oceans.
Yes as he was the titan of the ocean and seas.He was only surpassed by Poseidon,Zeus,Hades and Cronus.
Oceanus was the personified 'world-ocean', which circled the world. He was a Titan. Poseidon was the god of the sea.
Amphitrite. He fell in love with this Nymph when he saw her playing with her sisters. One of the gods Oceanus' grandaughters
There are a few. Okeanos (Oceanus) was the primordial personification of the sea, and Pontos (Pontus) was the Titan for whom Poseidon took over lordship of the oceans. His Roman counterpart was Neptune.
Medusa was the child of Phorcys and Ceto, who in turn were the children of Gaia and Oceanus.
Daughter of Doris and Nereus, or Oceanus and Tethys. Wife of Poseidon, Queen of the Sea. Mother of: Triton Rhode Cymopoleia Benthesikymê
Poseidon fought along with the other gods in the war against the Titans. In Percy Jackson and the Final Olympian, he was essential in defeating Typhon. He also fought Oceanus.
Poseidon was a son of Cronos, who was Oceanus' brother. Circe, according to some accounts was one of the Oceanids, one of Oceanus's daughters. This makes Poseidon and Circe cousins and both direct descendants of the titans. In Homer's story of the Odyssey, Circe aided Odysseus on his epic journey to return home to Ithaca while Poseidon opposed his return out of revenge for Odysseus having killed his son, the Cyclops Polyphemus. In this indirect way, Circe opposes Poseidon, but in the story, there is no mention of their direct enmity. I think if Poseidon found out Circe had helped Odysseus, Poseidon would have been extremely annoyed with her and perhaps would have even sent earthquakes and storms to her island.
Oceanus was a Greek Titan god who personified the world ocean. He was considered the source of all bodies of water, such as rivers, springs, and seas. Oceanus was typically depicted as a bearded man holding a serpent and was seen as a symbol of the unending flow of time and life.