Who is the first author who mentions that Vampires can reproduce?

Question

With the latest movie of Twilight saga I came to understanding that Vampires can have children. According to Wikipedia entry it is only possible between male vampire and human female.

If it is part of Vampire canon that is a different question. Surely Stephenie Meyer wasn't the first author to put that in their work hence my question:

Who was the first author to include the idea that male Vampires can have children?

Answer 1

Going through this list, it seems that the first appearance of a damphir in a book would be in 1980, in a book called Changeling by Roger Zelazny.

This assumes we're only talking about what could be considered "modern" literature, and not reproductions of Balkan or other legends in book form.

Answer 2

The Holmes-Dracula File, the second book in Fred Saberhagen's Dracula series was published in 1978 (predates the Zelazny book) and mentions a way a vampire and a normal human can have children.

A woman who becomes pregnant in the normal human way when she is also having an affair with a vampire will sometimes give birth to twins: one baby will be normal, one will be a vampire from birth.

Answer 3

I don't know for sure if this is the first, but Laurell K. Hamilton has a male vampire impregnating a female human in The Killing Dance from 1997. The woman mentions that they spent a lot of time in a hot tub (presumably to raise the body temperature of the vampire).