Goldsteinism was the heresy of heresies. However it emerged that "Goldsteinism" was created by Big Brother to entrap opponents of the regime. For a human being to insist 2 and 2 make 4 in defiance of the party saying otherwise was Winston Smith's major heresy.
The Great and Enduring Heresy of Mohammed
Heresies.
In Church history, there have been many 'heresies' during the 1st Millennium and afterwards. See related link below:
Ecumenical Councils, for the most part, have dealt with heresies, from the first one at Nicaea, which dealt with the Arian heresy through the Council of Trent, which dealt with the protestant heresy. that has been their main function, which a few notable exemptions, the Second Vatican Council dealt with no heresies, nor even any doctrinal issues, it was strictly a pastoral council. Unfortunately, due to the climate of the times, and the deep vein of Modernism which was running underground at the time, heresy followed that Second Vatican Council.
It defined the basic beliefs of the Church against all the heresies then present, and was later expanded to include the Arian heresy. It the the bedrock Baptismal Symbol for all Christians.
Christoph Ulrich Hahn has written: 'Geschichte der ketzer im mittelalter' -- subject- s -: Apostasy, Heresies and heretics, Heresy, Medieval Sects
The Catholic Church faced several heresies during the medieval period, including Hussitism. This heresy regarded the scriptures as being more important than church leadership, and also regarded ordinary people as being able to interpret scripture without Church help.
Heresy: adherence to a religious opinion contrary to church dogma. Many heresies came along throughout the Orthodox church. They were untolerated and were taken care of immediatly. Of the well known ones was Arius, who stated that Christ was neither human nor God. Rather he stated that Christ was a creature. Heresies did not necessarily help with the development of the Orthodox church. Heretics were either asked to renounce their heresy or were excommunicated as the Orthodox Church does not believe in change, whether in church doctrine and dogma, or the Churches Holy Traditions. In a way i guess you can say that they helped strengthen the church is belief.
In Christianity, these beliefs are called heresies, and those who hold them are called heretics. They are not pagans - pagans are not Christians at all - but Christians who have "gone off the rails" on an essential belief.
Saint Dominic de Guzman founded the Order of Preachers (Dominicans) to defend the Church against heresies, primarily the Albigensian heresy that was prevalent at the time.
It defined the importance of the church's beliefs
Brunoro a Sole has written: 'Consilium criminale D. Brunori a Sole, I.C. Veneti' -- subject(s): Early works to 1800, Consilia, Christian heresies, Heresy (Canon law)