Nicolas Remy (or Remi) (Latinized: Remigius) (1530-1612), was French judicial official involved with the Inquisition. His work on witch-hunting, Dæmonolatreia, was published in three books in Lugduni in 1595. Since there have been a German translation (1693) and an English one by Montague Summers under the name Daemonolatry (1930). Like the witch hunting works of Trithemius and Sprenger & Kramer (the infamous Malleus Maleficarum)*, the Daemonolatreia explains the horrors and dangers of the power of the witches, how to distinguish them, and how to torture and destroy them.
("The Festival" "The Dunwich Horror")
See also: Dæmonolatreia*editors note: it is amazing that Lovecraft never mentioned this quintessential work of witchcraft.