A few lessons in French maybe required if you want to seriously study the Dictionnaire Infernal (Infernal Dictionary)—an A-Z on demonology and the occult—though Google translate may offer an easier option to access the histories of such demonic figures as the Azazel, Bael or Zabulon. Written and compiled by French occultist, demonologist and author Jacques Auguste Simon Collin de Plancy, the Dictionnaire Infernal was first published in 1818 to considerable success, and was reprinted several times before its most incarnation in 1863 in an edition that contained 69 illustrations by artist Louis Le Breton.

Breton’s illustrations became the main source for nearly all future representations of demons, monsters and fantastical beasts. De Plancy filled his dictionary with detailed histories of the hierarchy of demons—-from lowly pot boilers (Ukobach) to the Seven Princes of Hell, the Demon Regent Asmodeus, Astaroth and Lucifer. He also included historical figures associated with the occult or free thought—from various kings and queens to Napoleon and Nostradamus and even the renowned author Sir Walter Scott. A title page from the 1826 edition described the book thus:

Infernal Dictionary, or, a Universal Library on the beings, characters, books, deeds, and causes which pertain to the manifestations and magic of trafficking with Hell; divinations, occult sciences, grimoires, marvels, errors, prejudices, traditions, folktales, the various superstitions, and generally all manner of marvellous, surprising, mysterious, and supernatural beliefs.

Though originally a free thinker—he had been greatly influenced by Voltaire in his youth—De Plancy eventually became a Roman Catholic and parts of the Infernal Dictionary show his vacillation from skeptic to devout believer. Unsurprisingly therefore, later editions were edited to fit in with Catholic theology. However, the Infernal Dictionary is still a highly important compendium of demonology and the occult—in particular the 1863 edition with its fabulous illustrations by Le Breton.

An edition of the Infernal Dictionnaire has been scanned by the Internet Archive and can be viewed here.
 

One of the Seven Princes of Hell: The demon Bael with his three heads.
 

The demon Buer—President of Hell.
 

The Beast Behemoth.
 
More of Le Breton’s demons and pages from the ‘Dictionnaire Infernal,’ after the jump…