Ordo Templi Orientis
Its documented history begins with Theodor Reuss's Masonic journal Oriflamme, launched in 1902, not with any medieval order. Crowley took charge of its British branch in 1912; his later story that Reuss appointed him for printing the ninth-degree secret in The Book of Lies cannot be right, as Crowley conceded, since that book had not yet appeared.
Theodor Reuss, Oriflamme (from 1902); The Confessions of Aleister Crowley (Penguin, 1989), pp. 708–709; Lawrence Sutin, Do What Thou Wilt: A Life of Aleister Crowley (2002 edn), p. 225
A ceremonial magic order claiming descent from the Knights Templar and Eastern tantra, later rebuilt around Aleister Crowley's teachings.