Mythology & Beliefs: Oceanus In Greek and Roman Mythology, Oceanus was the eldest of Titans; god of waters.
Oceanus in Greek and Roman Biography and Mythology
（Ὠκεανός), the god of the river Oceanus, by which,
according to the most ancient notions of the Greeks, the
whole earth was surrounded. An account of this river belongs
to mythical geography, and we shall here confine ourselves
to describing the place which Oceanus holds in the ancient
cosmogony. In the Homeric poems he appears as a mighty god,
who yields to none save Zeus. (Il. 14.245, 20.7, 21.195.)
Homer does not mention his parentage. but calls Tethys his
wife, by whom he had three daughters, Thetis, Eurynome and
Perse. (Il. 14.302, 18.398, Od. 10.139.) His palace is
placed somewhere in the west (Il. 14.303, &c.), and there he
and Tethys brought up Hera, who was conveyed to them at the
time when Zeus was engaged in the struggle with the Titans.
Hesiod (Hes. Th. 133, 337, &c., 349, &c.) calls Oceanus a
son of Uranus and Gaea, the eldest of the Titans, and the
husband of Tethys, by whom he begot 3000 rivers, and as manv
Oceanides, of whom Hesiod mentions only the eldest. (Comp.
Apollod. 3.8.1, 10.1.) This poet (Theoy. 282) also speaks of
sources of Oceanus. Representations of the god are seen on
imperial coins of Tyre and Alexandria. (Hirt, Mythol.
Bilderb. p. 149.) - A Dictionary of Greek and Roman
biography and mythology, William Smith, Ed.
Oceanus in Wikipedia
In classical antiquity, Oceanus (from Greek: Ὠκεανός, lit.
"ocean") was believed to be the world-ocean, which the
ancient Romans and Greeks considered to be an enormous river
encircling the world. Strictly speaking, Oceanus was the
ocean-stream at the Equator in which floated the habitable
hemisphere (oikoumene οἰκουμένη). In Greek mythology, this
world-ocean was personified as a Titan, a son of Uranus and
Gaia. In Hellenistic and Roman mosaics, this Titan was often
depicted as having the upper body of a muscular man with a
long beard and horns (often represented as the claws of a
crab), and the lower torso of a serpent (cf. Typhon). On a
fragmentary archaic vessel (British Museum 1971.11-1.1) of ca
580 BC, among the gods arriving at the wedding of Peleus and
the sea-nymph Thetis, is a fish-tailed Oceanus, with a fish in
one hand and a serpent in the other, gifts of bounty and
prophecy. In Roman mosaics, such as that from Bardo
(illustration, left) he might carry a steering-oar and cradle