"Shuma-Gorath first appears as an adversary for Doctor Strange in Marvel Premiere #10 (September 1973), created by writer Steve Englehart and artist Frank Brunner."
"The character's name is taken from Robert E. Howard's short story "The Curse of the Golden Skull", which features a dying magician named Rotath invoking the "iron-bound books of Shuma-Gorath" in a curse against humanity."