Lethe was one of the five rivers that flowed through the Underworld in Greek mythology. It passed through the cave of Hypnos (sleep); there, whoever drank from its waters, they forgot everything. The other four rivers were Styx, Acheron, Cocytus, and Phlegethon.
Lethe was also the personification of forgetfulness, a goddess who was the daughter of Eris, and sister to a number of siblings, including Ponos, Limos, Algea, Hysminai, Makhai, Phonoi, Androktasiai, Neikea, Pseudologoi, Amphilogiai, Dysnomia, Ate, and Horcus.
For MLA style citation use: GreekMythology.com, The Editors of Website. "Lethe". GreekMythology.com Website, 30 Aug. 2015, https://www.greekmythology.com/Other_Gods/Minor_Gods/Lethe/lethe.html. Accessed 17 June 2021.