Vampires have legends too. The story goes that Caine was the first vampire. Yes, the one from the Bible; don't ask me why we spell it with an E. He sired the second generation, and they did the third, and so on.

At least that's how it goes in areas where Abrahamic religions have been majority. Don't ask me if it's the same in other places. I'm not a Noddist, I haven't looked into it much.