Board Thread:Questions and Answers/@comment-11836-20170208210806/@comment-11836-20171124192916

Undoniel wrote: The Old Ones and related beings, including mentions of at least:
 * Yog-Sothoth (and maybe Cthulhu but I can't find back the reference) (I'm not advanced enough in reading Lovecraft to identify the others as Marvel or Lovecraft creations).

Yog-Sothoth is mentioned in Savage Sword of Conan Vol 1 2 and Cthulhu is referenced in Savage Sword of Conan Vol 1 52, which in turn are mentioned in the Demons appendix in Marvel Zombies Handbook Vol 1 1.