In Greek mythology, Tethys (Τηθύς) was a Titaness and sea goddess who was both sister and wife of Oceanus. She was mother of the chief rivers of the universe, such as the Nile, the Alpheus, the Maeander, and about three thousand daughters called the Oceanids.
Hera was not pleased with the placement of Callisto and Arcas in the sky, as the constellations Ursa Major and Ursa Minor, so she asked her nurse, Tethys, to help. Tethys, a marine goddess, cursed the constellations to forever circle the sky and never drop below the horizon, hence explaining why they are circumpolar.
With Oceanus :
Clitunno (Roman mythology)
Tiberinus (Roman mythology)
Tibertus (Roman mythology)
Volturnus (Roman mythology)
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