Aleister Crowley

Aleister Crowley (born Edward Alexander Crowley; 12 October 1875 – 1 December 1947) was an English occultist, ceremonial magician, poet, novelist, mountaineer, and painter. As the founder of the religion of Thelema in the early 20th century, he identified as its prophet, entrusted with guiding humanity into the Æon of Horus. A prolific writer, he published widely—composing the "Libri" of Thelema—over the course of his life.

Born to a wealthy family in Royal Leamington Spa, Warwickshire, Crowley rejected his parents' Plymouth Brethren faith to pursue an interest in Western esotericism. He was educated at Trinity College at the University of Cambridge, where he focused his attention upon mountaineering and poetry, resulting in several publications. Some biographers allege that here he was recruited into a British intelligence agency, further suggesting that he remained a spy throughout his life. In 1898, he joined the esoteric Hermetic Order of the Golden Dawn, where he was trained in ceremonial magic by Samuel Liddell MacGregor Mathers and Allan Bennett. He went mountaineering in Mexico with Oscar Eckenstein, before studying Hindu and Buddhist practices in India. In 1904, he married Rose Edith Kelly, and they honeymooned in Cairo, Egypt, where Crowley wrote down The Book of the Law—a sacred text that serves as the basis for Thelema, which he said had been dictated to him by a supernatural entity named Aiwass. The Book announced the start of the Æon of Horus and declared that its followers should "Do what thou wilt": seek to align themselves with their True Will via the practice of ceremonial magic.