Classification of demons
There have been various attempts throughout history by theologian scholars in the classification of Christian demons for the purpose of understanding the biblical and mythological context of adversarial spirits. Theologians have written dissertations in Christian demonology, classical occultism, classical mythology and Renaissance magic to clarify the connections between these spirits and their influence in various cultures. The study of demonology was historically used to understand morality, behavioral tendencies, and has even been used as symbolism to relay anecdotal tales in with which they lure people into temptation and may also include the angels or saints that were believed to have been their adversaries; an idea which derived from the Biblical battle between the Archangel Michael and the Antichrist in The Book of Revelation (12:7-9) describing a war in heaven which resulted in Satan and his angels being expelled from Heaven. The classifications of these fallen angels are based on many other characteristics as well, such as behaviors that caused their fall from heaven, physical appearances or the methods that were used to torment people, cause maladies, or elicit dreams, emotions, etc. Most authors who wrote theological dissertations on the subject either truly believed in the existence of infernal spirits, or wrote as a philosophical guide to understanding an ancient perspective of behavior and morality in folklore and religious themes.