Mnemosyne also presided over a pool[5] in Hades, a counterpart to the river Lethe, according to a series of 4th-century BC Greek funerary inscriptions in dactylic hexameter.

Mnemosyne is thought to have been given the distinction of "Titan" because memory was so important and basic to the oral culture of the Greeks that they deemed her one of the essential building blocks of civilization in their creation myth.

[8] Later, once written literature overtook the oral recitation of epics, Plato made reference in his Euthydemus to the older tradition of invoking Mnemosyne.

The character Socrates prepares to recount a story and says "ὥστ᾽ ἔγωγε, καθάπερ οἱ (275d) ποιηταί, δέομαι ἀρχόμενος τῆς διηγήσεως Μούσας τε καὶ Μνημοσύνην ἐπικαλεῖσθαι."

[9] Aristophanes also harked back to the tradition in his play Lysistrata when a drunken Spartan ambassador invokes her name while prancing around pretending to be a bard from times of yore.

These lift him, paralysed with terror and unconscious both of himself and of his surroundings, and carry him to the building where he lodged before with Tykhe (Tyche, Fortune) and the Daimon Agathon (Good Spirit).

The sons of Aloeus held that the Mousai were three in number, and gave them the names Melete (Practice), Mneme (Memory), and Aoide (Aeode, Song).