Oceanus was the personification of all oceans, or a great river that flowed in a circle around the earth. He was a source of all fresh water. In later time he personified the seas outside the Pillars of Hercules (the Straights of Gibraltar), or what we know today as the Atlantic Ocean. The oldest of the Titans, he fathered other gods who personified all rivers, lakes, and ponds with his sister/wife Tethys. Oceanus is portrayed as a horned god with the tail of a serpentine fish. He did not fight with Kronos in the Titanomachy.