In Greek mythology, Oceanus (/oʊˈsiː.ə.nəs/; Greek: Ὠκεανός, also Ὠγενός, Ὤγενος, or Ὠγήν) was a Titan son of Uranus and Gaia, the husband of his sister the Titan Tethys, and the father of the river gods and the Oceanids, as well as being the great river which encircled the entire world.

When Cronus, the youngest of the Titans, overthrew his father Uranus, thereby becoming the ruler of the cosmos, according to Hesiod, none of the other Titans participated in the attack on Uranus. However, according to the mythographer Apollodorus, all the Titans—except Oceanus—attacked Uranus. Proclus, in his commentary on Plato's Timaeus, quotes several lines of a poem (probably Orphic) which has an angry Oceanus brooding aloud as to whether he should join Cronus and the other Titans in the attack on Uranus. And, according to Proclus, Oceanus did not in fact take part in the attack.

Poseidon (/pəˈsaɪdən, pɒ-, poʊ-/; Greek: Ποσειδῶν, pronounced [poseːdɔ̂ːn]) was one of the Twelve Olympians in ancient Greek religion and myth, god of the sea, storms, earthquakes and horses. In pre-Olympian Bronze Age Greece, he was venerated as a chief deity at Pylos and Thebes He had also the cult title "earth shaker". In the myths of isolated Arcadia he is related with Demeter and Persephone and he was venerated as a horse, however it seems that he was originally a god of the waters. He is often regarded as the tamer or father of horses and with a strike of his trident, he created springs which are related with the word horse. His Roman equivalent is Neptune.

Poseidon was protector of seafarers, and of many Hellenic cities and colonies. Homer and Hesiod suggest that Poseidon became lord of the sea following the defeat of his father Cronus, when the world was divided by lot among his three sons; Zeus was given the sky, Hades the underworld, and Poseidon the sea, with the Earth and Mount Olympus belonging to all three. In Homer's Iliad, Poseidon supports the Greeks against the Trojans during the Trojan War and in the Odyssey, during the sea-voyage from Troy back home to Ithaca, the Greek hero Odysseus provokes Poseidon's fury by blinding his son, the Cyclops Polyphemus, resulting in Poseidon punishing him with storms, the complete loss of his ship and companions, and a ten-year delay. Poseidon is also the subject of a Homeric hymn. In Plato's Timaeus and Critias, the legendary island of Atlantis was Poseidon's domain.

Athena became the patron goddess of the city of Athens after a competition with Poseidon, and he remained on the Acropolis in the form of his surrogate, Erechtheus. After the fight, Poseidon sent a monstrous flood to the Attic Plain, to punish the Athenians for not choosing him.