I've seen this post reblogged around my Tumblr feed from time to time, and it claims that Mesperyian, a mythological figure of some kind or other, was Hades's "most beloved daughter."
I've never heard of this supposed goddess nor could I find anymore information about her, not even on Wikipedia, so I'm willing to bet that she's either a) made up (because tumblrites do that), b) a minor goddess of the Greek pantheon, or c) a minor goddess that was erroneously lumped in with the Greek pantheon (again, because tumblrites do that). Any ideas?
tl;dr Is Mesperyian an actual Greek goddess, or is my tumblr feed bullshitting me again?
It would seem this is the definitive source for all things Mesperyian. The story is painfully contrived, and the spelling is not standard Greek-Latin convention.
I don't know how to permalink a google search anymore, but "Mesperyian" and setting the search parameters to anything before January 1, 2009 yielded nothing fruitful, less than a page of results.
There are other reasons to find "Mesperyian" suspect. Torture was almost exclusively left to the Furies in any instance of torture being mentioned in the underworld (there are exceptions). Hades did have children though. In the Orphic Hymns (IIRC) Hades is father to the three Furies and Melinoe (who may or may not be associated with Hekate); in the Suda (10th c. Byzantium text) he is father to Makaria, goddess of blessed death; and in Aeschylus Sisyphus names Zageus as Hades's son. So the idea of Zeus having children isn't strange, nor is his having a daughter who is beautiful or one who is cruel. But I don't know of any that are both.
So, sounds made up. But not without (ancient) precedent. I wish I could tell you how cool it is that you are watching mythology in the making. If you have any interest in how the ancients would do the same kind of myth-making, check out the Documentary Hypothesis. It specifically hypothesizes that Deuteronomy was a rewriting of the Covenant Code to fit a theological agenda, and then it was placed in the mouth of Moses. These individuals have done the same thing: they created a goddess, made a (slightly too detailed to be believable) story to go with her, projected it back into the ancient world, and by doing so, have created authority for its veracity. It's very cool, if admittedly frustrating.