Robert E. Howard's A Witch Shall Be Born

"A Witch Shall Be Born" is one of the original stories by Robert E. Howard about Conan the Cimmerian. It was written in only a few days in spring of 1934 and first published in Weird Tales in 1934. The story concerns a witch replacing her twin sister as queen of a city state, which brings her into conflict with Conan who had been the captain of the queen's guard. Themes of paranoia, and the duality of the twin sisters, are paramount in this story but it also includes elements of the conflict between barbarism and civilization that is common to the entire Conan series.

Robert Ervin Howard (January 22, 1906 – June 11, 1936) was an American author who wrote pulp fiction in a diverse range of genres. He is well known for his character Conan the Barbarian and is regarded as the father of the sword and sorcery subgenre.
-Wikipedia.com