Postcard send by Otto Rahn to his father Karl, May 6, 1932

Catharism (from Greek: καθαρὀς, katharos, pure), a name of Christian religion in the Languedoc region of France and other parts of Europe in the XI-XIII centuries. The Paulicians of Armenia and the Bogomils of Bulgaria can be also called Cathars. Self-identification term Good Men (Bons Hommes) or Good Christians. Also known as Albigensians.