The author describes how the Albigensian Crusade led to the Inquisition. With two maps, a bibliography, and a preface by Hilaire Belloc. The author also discusses the relevance of the historical lessons of this period to American prohibition. Contents: Mediaeval recovery of civilization; Languedoc and the Albigenses; Preliminaries of the Crusade; Albigensian Crusade - The early war; Albigensian Crusade - Muret and its sequel; Mendicant Orders and the Inquisition; Epilogue on prohibition.