Catharism
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Catharism was a Christian quasi-dualist or pseudo-Gnostic movement which thrived in Southern Europe, particularly in northern Italy and southern France, between the 12th and 14th centuries.
Denounced as a heretical sect by the Catholic Church, its followers were attacked first by the Albigensian Crusade and later by the Medieval Inquisition, which eradicated the sect by 1350. Many thousands were slaughtered, hanged, or burnt at the stake, sometimes without regard for "age or sex."
St. Paul, by Valentin de Boulogne.
The Fall of the Rebel Angels by Hieronymus Bosch
Painting by Pedro Berruguete portraying the story of a disputation between Saint Dominic and the Cathars (Albigensians), in which the books of both were thrown on a fire and Dominic's books were miraculously preserved from the flames.
Heresy
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Heresy is any belief or theory that is strongly at variance with established beliefs or customs, particularly the accepted beliefs or religious law of a religious organization. A heretic is a proponent of heresy.
The Gospel triumphs over Heresia and the Serpent. Gustaf Vasa Church, Stockholm, Sweden, sculpture by Burchard Precht.
A statue in Vienna portraying Saint Ignatius of Loyola trampling on a heretic
The burning of the pantheistic Amalrician heretics in 1210, in the presence of King Philip II Augustus. In the background is the Gibbet of Montfaucon and, anachronistically, the Grosse Tour of the Temple. Illumination from the Grandes Chroniques de France, c. AD 1455–1460.
Former German Catholic friar Martin Luther was famously excommunicated as a heretic by Pope Leo X by his papal bull Decet Romanum Pontificem in 1520. To this day, the papal decree has not been rescinded.