WHAT WE KNOW:Edit
The third film in the Conan trilogy had been planned for a 1987 release with the title Conan the Conqueror. The director was to have been either Guy Hamilton or John Guillermin. Arnold Schwarzenegger, however, 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 film thus sank into development hell. The script was eventually turned into Kull the Conqueror.
The plot is a loosely based melange of motifs from previous Conan short stories, most notably "The Scarlet Citadel", with which it shares an almost identical storyline. It takes place when Conan is about forty-five, during his reign as King of Aquilonia, and follows a plot by a group of conspirators to depose him in favor of Valerius, heir to Conan's predecessor Numedides, whom he had slain to gain the throne. To accomplish this they resort to necromancy, resurrecting Xaltotun, an ancient sorcerer from the pre-Hyborian empire of Acheron. With his aid the Aquilonian army is defeated by that of the rival kingdom of Nemedia and occupied. Conan, captured, is slated for execution until the sympathetic slave girl Zenobia risks her life to free him.
Conan's quest to retrieve the Heart of Ahriman in order to defeat the wizard and regain his throne takes him through all the lands of Hyboria.
After his eventual triumph he vows to make Zenobia his queen.