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Metemphoc was the lord of the thieves of Ptahuacan in Antillia. Conan the Cimmerian sought out Metemphoc to enlist his aid in defeating the Antillian wizard-priests of the Hierarch of the Sacred Mysteries of Xotli and the demon-god Xotli.
When Conan succeeded in weakening the priest-caste and destroying Xotli, Metemphoc moved to consolidate power in Ptahuacan and assumed the rulership of the Isles of Antillia.