In this video we discuss the famous medieval "heretics" known as the Cathars, and the Albigensian crusade which tried to wipe them out.
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Sources/Suggested Reading:
Barber, Malcolm, The Cathars: Dualist heretics in Languedoc in the High Middle Ages, Second edition (Harlow, United Kingdom: Pearson, 2013).
Sennis, Antonio (ed.), Cathars in Question (York: York Medieval Press, 2016).
Moore, R. I., The War on Heresy (Cambridge, Mass.: Belknap Press of Harvard University Press, 2012).