The Waldenses, like the Franciscans, emerged from the apostolic movements within the Latin Church of the decades around 1200, but unlike the Franciscans they were driven underground. Not a full counter-Church, like the Cathar heretics, they formed a clandestine religious order, preaching to and hearing the confessions of their secret followers, and surviving until the Reformation. This volume begins by surveying modern historiography. Then, using both inquisition records from the Baltic to the Alps and the Waldenses' own books, the author deals with the asceticism of the Waldensian order, its practice of poverty and medicine, the culture of the Brothers and the preaching of the Waldensian Sisters, the way both used and mythicised history to support their position, and the composition of their followers. The final chapters examine their origins and authorship of the inquisitors' texts, and look through them to see how inquisitors viewed the Waldenses.