Moonchild is a novel written by the British occultist Aleister Crowley in 1917. Its plot involves a magical war between a group of white magicians, led by Simon Iff, and a group of black magicians, over an unborn child.
In this work, numerous acquaintances of Crowley appear as thinly disguised fictional characters. Crowley portrays MacGregor Mathers as the primary villain, including him as a character named SRMD, using the abbreviation of Mathers' magical name. Arthur Edward Waite appears as a villain named Arthwaite and the unseen head of the Inner Circle of which SRMD was a member. "A.B." is theosophist Annie Besant. Among Crowley's friends and allies, Allen Bennett appears as Mahatera Phang, Leila Waddell as Sister Cybele, the dancer Isadora Duncan appears as Lavinia King, and her companion Mary D'Este (mother of Preston Sturges, and who helped Crowley write his magnum opus Magick: Book 4 under her magical name "Soror Virakam") appears as Lisa la Giuffria. Cyril Grey is Crowley himself, while Simon Iff is either an idealized version of an older and wiser Crowley or his friend Allen Bennett.