The Klarkash-Ton Cycle: The Lovecraftian Fiction of Clark Ashton Smith (Chaosium Fiction) (Call of Cthulhu Fiction)
Clark Aston Smith first signed his letters to his new friend Lovecraft simply C.A.S. Next he signed himself Tsathoggua the Primordial, just as HPL sometimes used the signature Cthulhu or Grandpa Cthulhu. Soon he made of his initials a kind of mystery-cult name, Ci-Ay-Ess, subjoining his titles as the evangelist of Tsathoggua, and the archivist of Mu and Antares. And then, starting with his letter of June 27, 1930, he is Klarkash-Ton.