As related during the history of the vampires related in the book The Queen of the Damned, Khayman was the chief steward in the palace of King Enkil and Queen Akasha of Kemet (now Egypt) circa 5000 BCE.
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In The Queen of the Damned, it is stated in his point of view that he understood everything in a machine he sees operating, even down to the level of quantum physics.
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While Akasha slaughters most of her vampire children worldwide, Khayman accompanies Louis and Gabrielle to Maharet's house in Sonoma as one of the 13 surviving vampires who plan to stand against Akasha in The Queen of the Damned.