Ordo Templi Orientis (O.T.O.) ('Order of the Temple of the East' or 'Order of Oriental Templars') is an international fraternal and religious organization founded at the beginning of the 20th century by Carl Kellner and Theodor Reuss. English author and occultist Aleister Crowley is the best-known and most influential member of the order. Originally it was intended to be modelled after and associated with European Freemasonry, such as Masonic Templar organizations, but under the leadership of Ale...