In Greek mythology, Mnemosyne is a Titaness, daughter of Uranus and Gaia, and the goddess of memory. By Zeus she is the mother of the nine Muses. She was invoked by poets for accurate recollection, and in cult she was linked to springs or pools of Memory — counterparts to Lethe — especially at the oracle of Trophonius in Lebadeia.
Adapted from Wikipedia, "Mnemosyne" · CC BY-SA 4.0
I.Family
Hesiod counts Mnemosyne among the Titans born to Uranus and Gaia. After lying with Zeus for nine nights, she bore the nine Muses: Calliope, Clio, Euterpe, Erato, Melpomene, Polyhymnia, Terpsichore, Thalia, and Urania. Hyginus offers a minority parentage that makes her a daughter of Zeus and Clymene. In some local Heliconian traditions Memory (Mneme) appears instead as one of three earlier Muses alongside Melete and Aoide.
II.Memory, poetry, and the underworld
Although classed as a Titan, Mnemosyne functioned in living oral culture: epic poets called on her (and the Muses) at the start of performance so that the song would be remembered and delivered rightly. Plato's Euthydemus still cites that older habit of invoking the Muses and Mnemosyne together.
Funerary and Orphic texts of the fourth century BCE describe a pool of Mnemosyne in the underworld opposite the river Lethe. Ordinary souls drink forgetfulness before rebirth; initiates are instructed to drink from Memory instead, so that the soul may escape the cycle of transmigration.
III.Cult
She received modest but pointed worship. Pausanias describes her role at Lebadeia: the inquirer drinks water of Lethe, then water of Mnemosyne, descends to Trophonius, and afterward sits on the Chair of Memory to report the vision. Statues of her stood with the Muses in Athens and at the Temple of Athena Alea. In the cult of Asclepius, offerings or final prayers to Mnemosyne helped the incubant remember healing dreams. This entry is the Titaness of memory — not later allegorical "Lamps of Memory" in modern art alone.