Choronzon is mentioned by occultists in the 16th century, but became famous due to Aleister Crowley and his belief system, Thelema, described further in his book "Liber AL vel Legis" or "the Book of Law". It is also called the Dweller in the Abyss or the Demon of Dispersion, and held vast amounts of knowledge. In a ritual with his follower Victor Benjamin Neuberg, Crowley claimed to have summoned Choronzon within a seal in the Sahara Desert, but could not control it.