Τηθυς
One of the primordial divinities of the Greek theogonies. She was the personification of the feminine fecundity of the sea, and was the daughter of Uranus and Gaia, and the youngest of the Titanides (Table 5 and Table 12). She married Oceanus, one of her brothers, by whom she had more than 3,000 children who were all the rivers of the world. Tethys brought up HERA who had been entrusted to her by Rhea during Zeus' struggle against Cronus. As a sign of her gratitude, Hera managed to reconcile Tethys and Oceanus who had fallen out. Tethys' dwelling was usually situated in the Far West, beyond the country of the Hesperides, in the region where, each evening, the Sun comes to the end of its course.
{E2 DICTIONARY OF CLASSICAL MYTHOLOGY}