Nereus, in Greek Mythology, was the eldest son of Pontus and Gaia, the Sea and the Earth. See Hesiod, Theogony 233-36.
A Titan who with Doris fathered the Nereids. He lived with his family in the Aegean Sea. He was a shapeshifter with the power of prophecy and would aid heroes such as Heracles, who managed to catch him even as he changed shapes. Nereus and Proteus ("first") seem to be two manifestations of the god of the sea prior to being supplanted by Poseidon when Zeus overthrew Cronus.
Nereus was known for his truthfulness and virtue:
The Attic vase-painters showed the draped torso of Nereus issuing from a long coiling scaly fishlike tail *. Bearded Nereus generally wields a staff of authority.
Greek gods | Sea and river gods | Shapeshifting
Нерей | Nereus | Nereus | Nereo | Nérée | Nereo (mitologia) | Nerėjas | Nereus | ネレウス (ギリシア神話の神) | Nereus | Nereus | Нерей | Nereus | Nereus | 涅柔斯