A popular medieval religious movement, Catharism, arose amid church corruption, social crisis, and climate disaster and elicited brutal repression that led to the Inquisition.
Did the Inquisition Allow Heresy to Endure? Lessons from the 1335 Trial in Giaveno - Medievalists.net
Inquisitorial tribunals in the High Middle Ages were fragmented and inconsistent, enabling ascetic groups like the Waldensians to survive by adapting and exploiting systemic weaknesses.