Vespera

Vespera, Lady Vespera, or The Forgotten Secret Prisoner as called by Sophie Elizabeth Foster. She was locked in Lumenaria for an unkown amount of time, until Fintan Pyren, Gethen, and Ruy Ignis break her out. She created the original nightfall, which Lady Gisela based her version of Nightfall off of. (The links are different because there is not a page for the other nightfall yet)

She also was the one who (according to Councillor Bronte after translating the journals Lady Gisela provided) caused the skirmish between elves and humans, not because humans were greedy, but because she was abducting hundreds of humans in Atlantis and the old councillors did not pay any attention to the humans reports, complaints, and pleas.

In the end of Nightfall (The book), she joins forces with Lady Gisela because it was the best option over imprisonment, though still viewing Lady Gisela's views incorrect and sees her as a person who took her dream (Nightfall) and did not see the point of it and built a flawed version of it.