Glaucus

Glaucus's parentage is different in the different traditions: (i) Nereus;[1] (ii) Copeus;[2] (iii) Polybus, son of Hermes, and Euboea, daughter of Larymnus;[3] (iv) Anthedon and Alcyone;[4] or Poseidon and the nymph Naïs.

The herb made him immortal, but also caused him to grow fins instead of arms and a fish's tail instead of legs (though some versions say he simply became a merman-like being),[14] forcing him to dwell forever in the sea.

[15] In an alternate, non-extant version cited in Athenaeus (with reference to Nicander's Aetolian History), Glaucus chased a hare on Mount Oreia until the animal fell down almost dead, then carried his prey to a spring and rubbed it with a bunch of grass that was growing about.

[6] Alexander of Aetolia, cited in Athenaeus, related that the magical herb grew on the island Thrinacia sacred to Helios and served as a remedy against fatigue for the sun god's horses.

In Apollonius Rhodius's version, Glaucus appeared at the point when Telamon quarreled with Jason over Heracles and Polyphemus being left behind on the coast of Bithynia where Hylas had been lost.

Glaucus reconciled the two by letting them know that it had been ordained for Heracles to return to Eurystheus's court and complete his Twelve Labours, and for Polyphemus to found Cius, while Hylas had been abducted by a nymph and married her.

In Euripides's play Orestes, Glaucus appeared in front of Menelaus on the latter's voyage home, announcing to him the death of his brother Agamemnon by the hand of Clytaemnestra.

[19] According to Ovid and Hyginus, Glaucus fell in love with the beautiful nymph Scylla and wanted her for his wife, but she was appalled by his fish-like features and fled onto land when he tried to approach her.