Horus as bright as the sun was explained by a tale, known as "The Contendings of Horus and Seth". In this tale, it was said that Set, the patron of Upper Egypt, and Horus, the patron of Lower Egypt, had battled for Egypt brutally, with neither side victorious, until eventually the gods sided with Horus. As Horus was the ultimate victor he became known as "ḥr.w wr" "Horus the Great", but more usually translated "Horus the Elder". In the struggle, Set had lost a testicle, and Horus's eye was gouged out. Horus represented the eclipsing binary Algol in the Calendar of
Horus Heresy (fictional event) other authoritative sources are the "Horus Heresy" wargame environment (especially the associated rulebooks), and other expansions. "The Horus Heresy" is marketed as a sub-brand by Games Workshop, the Black Library (a Games Workshop publishing division), and Forge World, a modelling subsidiary. The associated product lines and related logos, places, names, devices and other components are copyrighted or trademarked. Games Workshop and affiliates have also released products that though not branded or classified as "Horus Heresy" items, are directly related to the fictional conflict or to specific facets of it. Illustrations and images from a variety of artists, about the conflict