This article describes the recent resurgence of the popular memory of the thirteenth-century Cathar, or Albigensian, heresy and its bloody repression in Languedoc, south-western France. After centuries of having been relegated to the realms of elite historical theological and political writing, today the memory of the Cathars dominates local history, culture, literature and tourism. Indeed, the popular memory of the Cathars has become central to collective identity and its expressions. The article explores how local professional historians have mediated, sometimes awkwardly, between academic history and popular history.