Ordo Templi Orientis
Ordo Templi Orientis (O.T.O.; lit. 'Order of the Temple of the East' or 'Order of Oriental Templars') is an occult secret society and hermetic magical organization founded at the beginning of the 20th century. The origins of O.T.O. can be traced back to the German-speaking occultists Carl Kellner, Theodor Reuss, Heinrich Klein, and Franz Hartmann.