Werewolves and vampires, old families.
Eleonore von Schwarzenberg https://de.wikipedia.org/wiki/Eleonore_von_Schwarzenberg
She not sleep at night and turned the castle into an alchemical laboratory and preferred mother's milk from wolves. Her tomb is more than interesting... in Český Krumlov/Bohemia. Her husband was shot by the emperor while hunting (just in time for the full moon?.). The area of Central Europe has a very long history about vampires and werewolves. Does anyone really still think that when the data can be preserved for more than a few millennia and gradually the truth of the claim is proven that it is a fabrication?
It will be difficult to accept the truth, especially for those who do not have the divine spark within them.
In the same way, the family of Rosenbergs is associated not only with vampires, but above all with werewolves. And many other black noble families which have one thing in common - a kinship with the families from period of the first Babylon.