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 body 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 a ship.