Queen of the Damned...(Anne Rice)

The Queen of the Damned, deals with the origins of vampires themselves. The mother of all vampires, Akasha, begins as a pre-Egyptian queen, in a land called Kemet (which will become Egypt), many thousands of years ago. During this time two powerful witches (Maharet and Mekare) live in the mountains of an unnamed region. The witches are able to communicate with invisible spirits and gain simple favors from them. During this period there is a bloodthirsty, invisible spirit known as Amel who continually asks the two witches if they need his assistance, although they prudently decline the offer. The witches' village is destroyed and they are incarcerated by the king and queen, who desire their knowledge. When the witches offend Akasha, the Queen condemns the twins. Enkil then orders his chief steward (who is Khayman as a mortal man) to rape the twins in his stead, which would prove their lack of power, before the eyes of the court. Afterward the witches are cast out into the desert. While making her way back home with a pregnant Maharet, Mekare curses the king and queen secretly with the bloodthirsty spirit. Eventually this spirit inflicts such torment on Akasha and Enkil that they again demand advice and help from the two witches.