According to Epimenides, the first two beings, Night and Aer, produced Tartarus, who in turn produced two Titans (possibly Oceanus and Tethys) from whom came the world egg. When Cronus, the youngest of the Titan's, 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. Oceanus seemingly also did not join the Titans in the "Titanomachy", the great war between the Cronus and his fellow Titans, and Zeus and his fellow Olympians, for control of the cosmos; and following the war, although Cronus and the other Titans were imprisoned, Oceanus certainly seems to have remained free. In Hesiod, Oceanus sends his daughter Styx, with her children Zelus (Envy), Nike (Victory), Cratos (Power), and Bia (Force), to fight on Zeus' side against the Titans, And in the "Iliad", Hera says that during the war she was sent to Oceanus and Tethys for safekeeping. Sometime after the war, Aeschylus' "Prometheus Bound", has Oceanus visit his nephew the enchained Prometheus, who is being punished by Zeus for his theft of fire. Oceanus arrives riding a winged steed, saying that he is sympathetic to Prometheus' plight and wishes to help him if he can. But Prometheus mocks Oceanus, asking him: "How did you summon courage to quit the stream that bears your name and the rock-roofed caves you yourself have made" Oceanus advises Prometheus to humble himself before the new ruler Zeus, and so avoid making his situation any worse. But Prometheus replies: "I envy you because you have escaped blame for having dared to share with me in my troubles." According to Pherecydes, while Heracles was travelling in Helios's golden cup, on his way to Erytheia to fetch the cattle of Geryon, Oceanus challenged Heracles by sending high waves rocking the cup, but Heracles threatened to shoot Oceanus with his bow, and Oceanus in fear stopped.