Depictions of demons and the devil with extra faces, often on the groin, are common in medieval manuscripts. Some theorize that it represents their spiritual corruption, by emphasizing the senses that focus on the material world, others think it’s merely to make them monstrous.
supernatural
The preeminent source of jinn-lore is One Thousand and One Nights (aka Arabian Nights), a collection of tales from Arabic, Persian, Egyptian and Mesopotamian traditions. The evolving collection has stories of characters we know today, like Aladdin and Sinbad.
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Illustrations by Martin van Maële from the 1911 edition of the book Satanism and Witchcraft (La Sorcière) by Jules Michelet, first published in 1862. While widely inaccurate, the book was one of the first sympathetic portrayals of the history of witchcraft.
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After witnessing a mesmerist induce a trance, Edgar Allan Poe included it in his story The Facts in the Case of M. Valdemar. In the tale, a dying man is put into a trance and able to speak and move his “swollen black tongue” after death. The tale was written like a medical case study.
At the time, Poe was a journalist and the story was taken as a news report, never being explicitly presented as fiction. It was even reprinted in London’s Sunday Times with the headline: Mesmerism in America: Astounding and Horrifying Narrative, helping legitimize and popularize mesmerism.
Source is Occult America by Mitch Horowitz. It’s a fantastic read, and highly recommended!