Ordo Templi Orientis (O.T.O.) can be translated as Order of Oriental Templars, or Order of the Temple of the East. It is a secret, fraternal organization similar to that of Freemasonry, with a series of graded initations. For its teachings and principles of organization, it has accepted the Law of Thelema, which is expressed as “Do what thou wilt.” Thelemites believe that this Law was established with the writing of the Book of the Law by Aleister Crowley in 1904 in Cairo, Egypt.
According to Crowley, O.T.O. is "the first of the great religious Societies to accept the Law." The rituals of O.T.O. have been entirely revised by Crowley and his successors in light of the Law of Thelema. Both within its private ceremonies and in the world at large, the Order seeks to promote the Law as the ultimate standard of human conduct and understanding.
O.T.O. has two core areas of ritual activity: initiation into the Mysteries, and the celebration of Liber XV, the Gnostic Mass. In addition, the Order organizes lectures, classes, social events, theatrical productions and artistic exhibitions, and publishes books, journals, and newsletters.
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