In Stargate SG-1, a story arc is built around the "Harcesis" - a child born of two Goa'uld hosts.
In the Stargate universe, the Goa'uld are parasitic snake-like creatures that can insert themselves into human hosts, usurping the human mind; in effect, a person so infected "becomes" the Goa'uld within. Goa'uld also have "genetic memory" - when they reproduce, they can pass on their knowledge to their offspring genetically. The Harcesis is a human, conceived in the normal fashion between two humans, while each of whom is host to a Goa'uld. Such a child is born with the genetic memories of the Goa'ulds who inhabited the parents, making it somewhat superhuman.
Given that much of the Stargate universe connects real-world cultures and mythologies with fictional ancient alien interactions, I am left to wonder whether either the term "Harcesis" or the concept have roots in any real-world ancient legend, as in so much of Stargate mythology?
Was it purely an invention of the SG-1 writing team?