In Greek mythology, one of the primordial early gods who was a Titan believed to be a giant river constantly flowing, going around the world. The father of Oceanus was Ouranos, and the mother was Gaia. In the Iliad, the goddess Hera mentions visiting Oceanus, and it was depicted on the sheild of the Greek hero Achilles. Oceanus' siblings were Cronus, Rhea, and Tethys. Later on, a new generation of gods took over, ruled by Zeus, Poseidon and Hades.