Thulsa Doom is a character created by Robert E. Howard, as an antagonist for the character Kull of Atlantis. Thulsa Doom debuted in the story "Delcarde's Cat". He has since appeared in comic books and film as the nemesis of Kull and, later, one of Howard's other creations, Conan the Barbarian.
Notes:
First appearance in The Cat and the Skull (1928)
Created by Robert E. Howard