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 To this day, the papal decree has not been rescinded.
Excommunication is an institutional act of religious censure used to deprive, suspend, or limit membership in a religious community or to restrict certain rights within it, in particular those of being in communion with other members of the congregation, and of receiving the sacraments.
Fanciful 16th-century fresco in the Sala Regia, by Giorgio Vasari, depicting Pope Gregory IX excommunicating Frederick II. Since few details were provided to the artist, Vasari chose to paint an excommunication scene generically. In the traditional excommunication procedure, the pope and his priests would hurl burning candles on the ground and stamp them out. The painter however here chose to show the pope personally stepping on the emperor.
Plaque on exterior of the Chiesa della Pietà in Venice, the church of the orphanage. This is where the foundling wheel once stood. The inscription declares, citing a 12 November 1548 papal bull of Pope Paul III, that God inflicts "maledictions and excommunications" on all who abandon a child of theirs whom they have the means to rear, and that they cannot be absolved unless they first refund all expenses incurred.
Martin Luther was excommunicated by Pope Leo X in 1521.
Threat of excommunication for stealing books from the Salamanca University library
