In Greek mythology, Tethys 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.

During the war against the Titans, Tethys raised Rhea as her god-child.

Tethys is sometimes confused with Thetis, the wife of Peleus and mother of Achilles.

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.

Consorts/Children

1. With Oceanus
   1. Achelous
   2. Acheron
   3. Alpheus
   4. Amaltheia
   5. Amphitrite
   6. Asia
   7. Asopus
   8. Callirhoe
   9. Catillus
   10. Cebren
   11. Cephissus
   12. Circe
   13. Clitunno (Roman mythology)
   14. Clymene
   15. Crinisus
   16. Dione
   17. Doris
   18. Electra
   19. Enipeus
   20. Eurynome
   21. Inachus
   22. Lysithea
   23. Melia
   24. Meliboea
   25. Merope
   26. Nilus
   27. Peneus
   28. Perse
   29. Philyra
   30. Pleione
   31. Rhode
   32. Scamander
   33. Telesto
   34. Tiberinus (Roman mythology)
   35. Tibertus (Roman mythology)
   36. Tyche
   37. Volturnus (Roman mythology)