Oceanus

Oceanus was the primordial Titan god of the great, earth-encircling River Okeanos, font of all of the earth's fresh-water - rivers, wells, springs and rain-clouds. He was also the god who regulated the heavenly bodies which rose from and set into his waters.

Unlike his Titan-brothers Okeanos did not participate in the castration of their father Ouranos nor did he join the war against Zeus and the other Olympian gods.

Okeanos was depicted in ancient Greek vase paintings as a bull-horned god with the tail of a serpentine fish, a form shared by his River-God sons. His usual attributes were a fish and serpent.

In the Hellenistic era, Okeanos was reimagined as the god of the then increasingly accessible Atlantic and Indian Oceans, and the old cosmological idea of a great, earth-encircling, fresh-water stream was discarded. In mosaic art he is therefore usually depicted as a sea-god or the sea itself personified, with crab-claw horns, and for attributes, a serpent, oar and school of fish.