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Here is some academic references:
Bearer of a fair offspring, name by which Demeter was invoked in the Thesmophoria, Ar.Th.299, Alciphr.2.4, cf.IG14.205 (Acrae); or her nurse, Ar. ap. Phot.; epith. of the Moon, Hymn.Mag.5.31; of the Earth, Apollod. ap. Phot.:—neut. pl., Καλλιγένεια θύειν offer sacrifice to Demeter K., Alciphr.3.39 (nisi leg. τῇ Κ.).
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An early mention of the pool of Mnemosyne can be found in the Petelia Gold Tablet, an Orphic inscription from between 300-200 BC:
You will find in the halls of Hades a spring on the left,
and standing by it, a glowing white cypress tree;
Do not approach this spring at all.
You will find another, from the lake of Memory
refreshing water flowing ...
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From theoi.com:
KALLIGENEIA (Calligeneia) was the nymph nursemaid of the goddess Demeter and her daughter Persephone. She was worshipped as a goddess of the Eleusinian Mysteries.
Kalligeneia was perhaps the Naiad-nymph of the sacred Kallikhoros (Callichorus) spring of Eleusis. Alternatively her name might simply be a title of the earth-goddess Gaia.
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It’s not a goddess, but instead a day.
The quote is from Kalligeneia: Fertility and Feminine Focus on an
Athenian Bell Krater, an undergraduate research paper by Suzanne Allison and offers a nice description of Kalligeneia:
The final day of the festival is the Kalligeneia, “beautiful birth”, when the women would feast and celebrate. The portrayal of ...
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