This is the 23rd lecture in David Guzik's series on Church History, wherein he details the history of Peter Valdes (also known as Peter Waldo, or Valdo; in French: Pierre Vaudès, or de Vaux; in Latin: Petrus Waldus, or Valdus), his clashes with the Catholic Church, and the Waldenses who followed him.

• Peter Valdes / Waldo (c. 1140 – c. 1205)