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Greek deities series
Primordial deities
Titans and Olympians
Chthonic deities
Personified concepts
Other deities
Aquatic deities
Poseidon Oceanus Ceto Nereus Glaucus Thetis Amphitrite Tethys	Triton Ophion Proteus Phorcys Pontus Oceanids Nereids Naiads

Nereus, in Greek Mythology, was the eldest son of Pontus and Gaia, the Sea and the Earth, a Titan with whom Doris fathered the Nereids, with whom Nereus lived in the Aegean Sea.^[1] In the Iliad^[2] the Old Man of the Sea (άλίός γέρών) is the father of Nereids, though Nereus is not directly named. He was one of the manifestations of the Old Man of the Sea, never more so than when he was described, like Proteus, as a shapeshifter with the power of prophecy, who would aid heroes such as Heracles^[3] 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 who was supplanted by Poseidon when Zeus overthrew Cronus.

The earliest poet to link Nereus with the labours of Heracles was Pherekydes, according to a scholion on Apollonius of Rhodes.On Argonautica]] iv.1396f, noted by Ruth Glynn,"Herakles, Nereus and Triton: A Study of Iconography in Sixth Century Athens" American Journal of Archaeology 85.2 (April 1981, pp. 121-132) p 121f.

During the course of the fifth century BCE, Nereus was gradually replaced by Triton, who does not appear in Homer, in the imagery of the struggle between Heracles and the sea-god who had to be restrained in order to deliver his information that was employed by the vase-painters, independent of any literary testimony.^[4]

Nereus was known for his truthfulness and virtue:

But Pontos, the great sea, was father of truthful Nereus who tells no lies, eldest of his sons. They call him the Old Gentleman because he is trustworthy, and gentle, and never forgetful of what is right, but the thoughts of his mind are mild and righteous. — Hesiod, Theogony 233

The Attic vase-painters showed the draped torso of Nereus issuing from a long coiling scaly fishlike tail^[5] Bearded Nereus generally wields a staff of authority. He was also shown in scenes depicting the flight of the Nereides as Peleus wrestled their sister Thetis.

In Aelian's natural history, written in the early third century of the Common Era,^[6] Nereus was also the father of a watery consort of Aphrodite named Nerites who was transformed into "a shellfish with a spiral shell, small in size but of surpassing beauty."

• Karl Kerenyi, 1951. The Gods of the Greeks
• Robert Graves, The Greek Myths

• [[1]] - Theoi Project, Nereus - the sea-god in classical literature and art