The Titan Goddess Mnemosyne is said by Hesiod the poet to be mother of the Muses and Zeus their father; but beyond this there is very little myth or legend associated with her. 
    As a consequence scholars have suggested she is named simply as an abstraction - the personification of memory.

The reason being that as mother of the Muses, Mnemosyne is essentially an allegory - memory produces the arts and crafts (the Muses).
    In truth there is no evidence, beyond Hesiod's claim she is mother of the Muses. As for personification - the other Titans exist, so too Mnemosyne.

Mnemosyne is among those Goddesses - Nemesis, Hecate, the Keres and the Fates - who generally appear in long cloak and hood. To date she has not revealed her face. However we can describe her as tall and slender, her dark coloured cloak is edged with gold and she wears silver sandals.
    On first encounter she sounded angry though her voice is a husky whisper:

 "I am the great Goddess Mnemosyne. Few mortals have heard of me, yet I am more powerful than some they know of.
     I have been neglected for so long. This I find hard to forgive, yet you mortals appear so dedicated that in your case I shall relent. You welcome me and burn incense for me. I appreciate this.  

I am a Goddess who is very careful, very serious and perhaps in your words, suspicious. I see you fear many of us and so you should; but never hesitate to submit yourself to tests." 

The following team-member's account reveals something of the nature of Mnemosyne's tests:
 '...A very claw-like hand grabbed me and I was wafted through a thick mist for about 2 or 3 seconds then it cleared and I found myself standing in the middle of a very long bridge over a river. 
    On one side of the bridge was a steep grassy hill from where I could hear faint strains of music though it might have been an echo. 

The other side of the bridge sloped downhill. I could hear music from there and laughter and thought I heard an odd scream. I stayed still for a moment. The lazy side of me wanted to go down the hill - for the steep hill on the other side looked too much.
    On the down slope I could hear plenty of people enjoying themselves but again I heard a faint squeal. So I turned and went towards the uphill. 
    As I reached the end of the bridge and started to climb there was movement under my feet and I was frightened for a second; but as the rumbling took place the hill amazingly became less steep and very gradually it flattened out and although still a hill it was much more gentle and I walked along. I could hear birds singing and some laughter but not loud. Ahead I saw a beautiful temple, quite large. The walls were pink, the door cranberry and the roof blue. I stood outside and it looked lovely. as I heard her speak:
    "Sometimes the hardest part is the easiest.
    I have hundreds of temples now around the world, yet one can never have enough. I shall influence the minds of those who build my new temples in the future and they all will be like this."

Festival of Mnemosyne: 27th July