Tethys: The Ancient Mother Goddess of the Oceanids
Tethys is, in Greek Mythology, married to Titan Oceano and together they are the parents of the Oceanids (they mean the fertility of the water). Like Ocean, Tethys is the Ancient Goddess represented by being the Sea.
Tethys in Greek Mythology:
Tethys, in Greek Mythology, was a titanid, daughter of Uranus and Gaia. From her union with her brother Oceanus, they were born as oceanic. The ocean are three thousand, and they also had three thousand rivers as children. It personifies the fertility of the water, which feeds the bodies and forms the sap of the vegetation. Tethys took care of Hera, given to her by Reia, during the fight between the titans and the Olympic gods.
In recognition, an Olympian queen reconciled her with Oceano, when the couple fell out. Tethys is represented as a young, wise-looking woman. She wanders around the world in an ivory shell, pulled by white horses. The name of the titanid Tethys is the same, in Portuguese, as her granddaughter, the nereid Thetis, daughter of Doris (one of the oceanic) and mother of Achilles.
Tethis (granddaughter of the ancient goddess Tethys) is a sea nymph and also one of the fifty nereid daughters of the ancient sea god. When carried like a nereid, Tethys was the daughter of Nereus and Doris, and granddaughter of Tethys, a titanid. She had several children, among them, Achilles. Tethys is named by Hesiod as "silver feet." Homer refers to her as "the goddess of silver feet."
A little more about Nereida:
It was created by Hera, to whom she devoted great friendship. She picked up Hephaestus when the god was precipitated from Olympus by Zeus. Loved by the sovereign of the gods, she resisted him, fearing to hurt Hera. According to another version, it was Zeus himself who repudiated it. The Olympic lord feared the realization of an oracle according to which Tethys would conceive of him a son who would dethrone him. In a variant of the legend, such an oracle referred to Zeus and Poseidon, both in love with the nereid.
So that the prophecy is not fulfilled, the king of the gods hurried to marry the beloved with the mortal Peleus, king of Phytia (Thessaly), son of Eacol and grandson of Zeus, on the part of father, and great friend of Heracles. Tethys, however, fled the court of the groom, transforming himself into several elements. On the advice of the centaur Chiron, Peleus held it violently, until the nereid returned to its natural form. The wedding was celebrated in the presence of the gods and the muses. Seven children were born from the union. To purify the children of the mortal elements inherited from their father, Tethys exposed them to fire, resulting in his death.
According to one tradition, when he tried to purify his seventh son, Achilles, Peleus intervened, saving the child. Annoyed, Tethys left her husband and returned to the bottom of the sea. She protected her son throughout the hero's life, trying to keep him from danger and comforting him in sadness. She was unable, however, to prevent him from dying in the Trojan War, as she had thus decreed Fate. After the hero's death, she took Neoptolemus under her protection.