Edward Alexander (Aleister) Crowley was born October 12, 1875 in Leamington Spa, England. His parents were members of the Plymouth Brethren, a fundamentalist Christian sect.
Aleister grew up with a thorough biblical education and an equally thorough disdain of Christianity.
leaving just before completing his degree.
The Golden Dawn was an occult society led by S.L. MacGregor Mathers which taught magick, kabalah, alchemy, tarot, astrology, and other hermetic subjects.
It had many notable members (including A. E. Waite, Dion Fortune, and W. B. Yeats), and its influence on the development of modern western occultism was profound.
Crowley was initiated into the Golden Dawn in 1898.
He proceeded to climb up rapidly through the grades.
But in 1900 the order was shattered by schism, and Crowley left England to travel extensively throughout the East.
supplementing his knowledge of western-style ritual magick with the methods of Oriental mysticism.
In 1903, Crowley married Rose Kelly, and they went to Egypt on their honeymoon.
After returning to Cairo in early 1904, Rose (who until this point had shown no interest or familiarity with the occult) began entering trance states and insisting to her husband that the god Horus was trying to contact him.
As a test, Crowley took Rose to the Boulak Museum and asked her to point out Horus to him.
She passed several well-known images of the god and led Aleister straight to a painted wooden funerary stele from the 26th dynasty, depicting Horus receiving a sacrifice from the deceased, a priest named Ankh-f-n-khonsu.
Crowley was especially impressed by the fact that this piece was numbered 666 by the museum, a number with which he had identified since childhood.
He began to listen to Rose, and at her direction, on three successive days beginning April 8, 1904, he entered his chamber at noon and wrote down what he heard dictated from a shadowy presence behind him.
The result was the three chapters of verse known as Liber AL vel Legis, or The Book of the Law.
This book heralded the dawning of the new aeon of Horus, which would be governed by the Law of Thelema.
As the prophet of this new aeon, Crowley spent the rest of his life working to develop and establish Thelemic philosophy.
In 1906 Crowley rejoined George Cecil Jones in England, where they set about the task of creating a magical order to continue where the Golden Dawn had left off.
They called this order the A.'. A.'.
(Astrum Argentium or Silver Star), and it became the primary vehicle for the transmission of Crowley's mystical and magical training system based on the principles of Thelema.
This group of high-ranking Freemasons claimed to have discovered the supreme secret of practical magick, which was taught in its highest degrees.
Apparently Crowley agreed, becoming a member of O.T.O. and eventually taking over as head of the order when Reuss suffered a stroke in 1921.
Crowley reformulated the rites of the O.T.O. to conform them to the Law of Thelema, and vested the organization with its main purpose of establishing Thelema in the world.
The order also became independent of Freemasonry and opened its membership to women and men who were not masons.
However, his legacy lives on in the Law of Thelema.