In 1818 his most known work, Dictionnaire Infernal, was published for the first time in 1818, and in 1863 there were added some images that made famous the edition; this is a book on demonology, which contains some imaginative drawings concerning the appearance of certain demons.
Collin de Plancy followed the tradition of many previous demonologists of cataloguing demons by name and title of nobility, as it happened with grimoires like Pseudomonarchia Daemonum, and The Lesser Key of Solomon among others.