Okeanos (Ancient Greek: Ὠκεανός) was a son of Gaea and Ouranos. He was one of the eldest Titans along with Tethys, Kronos, Rhea, Theia, Hyperion, Themis, Krios, Mnemosyne, Koios, Phoibe, and Iapetos. He is the Titan of the sea and all water boundaries.