Who was Thalia's mother? I do not mean Thalia the muse/grace/nereid. I speak of Thalia the nymph), daughter of Hephaestus. She has a stub Wikipedia page that says Zeus forced he in the form of an eagle and buried her body to avoid Hera's jealousy. But , it makes no note of who Thalia's mother was.

I've done some preliminary research, and found nothing on Thaleia.

This is one of those wonderful little "mythical myths" where the only sources are secondary: all we know of this nymph comes from a mention in ancient text "The Life of Aeschylus" with no author attributed. The mention is apparently in relation to a lost play of Aeschylus.

So that's all the information there is, and it's highly unlikely there will be any more information forthcoming.

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_PS- thanks for raising this question. The wikipedia article should be amended to use the spelling in the sole reference,Thaleia, because the current spelling in the wiki injects needless confusion._