From The Real-Life ‘Conjuring’ To A Satanic Nun, Explore 9 Horrifying Tales Of Demonic Possession

Published October 25, 2022
Updated February 12, 2025

The Demonic Possession Of A Nun And Her Letter From Satan

Nun's Letter Of Demonic Possession

Daniele AbateSister Maria Crocifissa della Concezione’s letter was written in an unknown language.

On Aug. 11, 1676, a 31-year-old nun named Sister Maria Crocifissa della Concezione penned a letter “from the devil” as she struggled with an alleged demonic possession in Palma di Montechiaro, Sicily.

As the story goes, Sister Maria was found that day lying on the floor of her cell. Her face was covered in ink, and there was a letter nearby containing 14 lines written in an unknown language. The nun claimed that the letter had been written by the devil, who’d tried to convince her to abandon God.

Though the letter was written using strange symbols, researchers took a crack at deciphering it in 2017. They used modern-day software to study the 341-year-old letter and were able to untangle its meaning.

Palma Di Montechiaro

Archenzo/Wikimedia CommonsA church in Palma di Montechiaro, the Italian town where Sister Maria Crocifissa della Concezione penned her letter.

According to Live Science, the research team theorized that Sister Maria had created the foreign script based on actual languages that she knew. Sure enough, they found that her letter contained words from ancient Greek, Latin, Runic, and Arabic.

“We analyzed how the syllables and graphisms [or thoughts depicted as symbols] repeated in the letter in order to locate vowels, and we ended up with a refined decryption algorithm,” Daniele Abate, the director of the Ludum Science Center, told Live Science.

Abate’s team found that Sister Maria’s jumble of ancient symbols did include coherent messages, though it also rambled at parts. One passage read: “God thinks he can free mortals… The system works for no one… Perhaps now, Styx [the river that separates the dead and the living] is certain.” Another passage referred to the Holy Trinity “dead weights.”

At the time, the church considered Sister Maria a victim of demonic possession and her mysterious letter from the devil evidence of “innumerable evil spirits.” She was blessed soon after writing it, leaving the meaning of her demonic dispatch unknown for three centuries.

author
Kaleena Fraga
author
A senior staff writer for All That's Interesting since 2021 and co-host of the History Uncovered Podcast, Kaleena Fraga graduated with a dual degree in American History and French Language and Literature from Oberlin College. She previously ran the presidential history blog History First, and has had work published in The Washington Post, Gastro Obscura, and elsewhere. She has published more than 1,200 pieces on topics including history and archaeology. She is based in Brooklyn, New York.
editor
Jaclyn Anglis
editor
Based in Brooklyn, New York, Jaclyn Anglis is the senior managing editor at All That's Interesting, where she has worked since 2019. She holds a Master's degree in journalism from the City University of New York and a dual Bachelor's degree in English writing and history from DePauw University. In a career that spans 11 years, she has also worked with the New York Daily News, Bustle, and Bauer Xcel Media. Her interests include American history, true crime, modern history, and science.
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Fraga, Kaleena. "From The Real-Life ‘Conjuring’ To A Satanic Nun, Explore 9 Horrifying Tales Of Demonic Possession." AllThatsInteresting.com, October 25, 2022, https://allthatsinteresting.com/demonic-possession. Accessed July 31, 2025.