A language of magic, Enochian was recorded by Dr. John Dee, a 16th-century magician. Dee attributed Enochian to the "angels" with whom he "communicated" through his assistant Edward Kelley, and explained that it was transmitted to him in the form of 19 "Keys," or "Calls"—formal incantations or invocations of occult powers. As a language of magic, it has been periodically adopted by occultists ever since. Aleister Crowley revived it for use in his rituals at the beginning of the 20th century, and more recently it has been appropriated by Satanist Anton La Vey.