Loos first wrote letters to the city authorities, and, failing in that effort, he sought in 1592 to publish a book protesting against the hunts and questioning some of the beliefs of the witch hunters.
The attempted publication of De vera et falsa magia (True and False Magic)[1] offended Petrus Binsfeld, the Suffragan Bishop of Trier and deputy to Johann VI von Schonenberg, one of the highest-ranking officials in the Holy Roman Empire.
In 1886, American George Lincoln Burr discovered the manuscript of True and False Magic in the Jesuit Library in Trier (a remnant of the University, which was dissolved in 1798).
In his work, Loos is believed to have been influenced by the arguments of Johann Weyer, a Protestant Dutch physician, who in 1563 put forth a book attacking the persecution of witches while also categorizing kinds of magical demons.
[6] Even though his work was lost for 300 years, his opponent Martin Del Rio ensured his continuing fame by publishing a book denouncing him, and by summarizing each of his arguments in the recantation he forced Loos to sign.