User blog comment:B214/Volume 22 spoilers/@comment-30048084-20161031183100/@comment-10330822-20161113034458

Yeah, Crimson and Darkness is right. Valerie is the one from the Tepes Faction, as in Vlad Tepes, Dracula. That was the whole arguement among the Vampires, whether Vlad Tepes was the ancestor of the Vampires, or that Carmilla from the was the ancestor.

The thing is, if you know the story, Carmilla was an anagram for Mircalla, the Countess Karnstein in the Carmilla novella by Joseph Sheridan Le Fanu, which predates Bram Stroker's Dracula.

So, in all likelihood, Elmenhilde would be the descendant of Countess Karnstein, since they share last names, and the great-great-grandparent Issei would have to worry about would be her, Lady Carmilla, not Dracula.