The third film in the Conan trilogy was planned for 1987 to be titled Conan the Conqueror. The director was to be either Guy Hamilton or John Guillermin. However Arnold Schwarzenegger was committed to the film Predator and De Laurentiis's contract with the star had expired after his obligation to Red Sonja and Raw Deal and he wasn't keen to negotiate a new one. The third Conan movie thus sank into development hell. The script was eventually turned into Kull the Conqueror.
Read more about this topic: Conan The Destroyer