Zombies' First Creator

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Where exactly did zombies originally come from, or when were they first imagined? I wonder if people in the medieval ages were the first ones to think of the existence of the living dead who craved human flesh, or if it were the people from the times of the crusades, or if it's always been a long living fear in people of getting eaten alive by their own kind. For Zombies are still living on in the entertainment industry and peoples' fears.