In 1676, Sister Maria Crocifissa della Concezione of the Palma di Montechiaro convent wrote a coded letter. The letter was found in her room and she had no previous recollection of actually writing it, leading her to claim that Satan had possessed her and used her hand to write it.
For over 300 years it has remained a mystery as no one had been able to decode the letter which had been written using symbols and letters that resembled aspects of Greek, Arabic, Latin, and the Runic alphabets. Sister Maria was an accomplished linguist due to her studies at the convent which had led some researchers to believe that she wrote this letter in a language of her design based on languages and symbols she was already aware of.
Coding software available on the dark web helped a team of Italian computer scientists translate 15 lines from the letter discussing the relationship between God, Satan and mankind. The letter is said to refer to God and Jesus as 'Dead Weight.'