
Heresy is any belief or theory that is strongly at variance with established beliefs or customs, in particular the accepted beliefs of a church or religious organization.
The term is usually used in reference to violations of important
religious
Religion is usually defined as a social- cultural system of designated behaviors and practices, morals, beliefs, worldviews, texts, sanctified places, prophecies, ethics, or organizations, that generally relates humanity to supernatural, ...
teachings, but is also used of views strongly opposed to any generally accepted ideas. A heretic is a proponent of heresy.
The term is used particularly in reference to
Christianity
Christianity is an Abrahamic monotheistic religion based on the life and teachings of Jesus of Nazareth
Jesus, likely from he, יֵשׁוּעַ, translit=Yēšūaʿ, label=Hebrew/Aramaic ( AD 30 or 33), also referred to as Jesu ...
,
Judaism
Judaism ( he, ''Yahăḏūṯ'') is an Abrahamic, monotheistic, and ethnic religion comprising the collective religious, cultural, and legal tradition and civilization of the Jewish people. It has its roots as an organized religion in the ...
, and
Islam. In certain historical Christian, Muslim, and Jewish cultures, among others, espousing ideas deemed heretical has been (and in some cases still is) met with censure ranging from
excommunication
Excommunication is an institutional act of religious censure used to end or at least regulate the communion of a member of a congregation with other members of the religious institution who are in normal communion with each other. The purpose ...
to the death penalty.
Heresy is distinct from
apostasy
Apostasy (; grc-gre, ἀποστασία , 'a defection or revolt') is the formal disaffiliation from, abandonment of, or renunciation of a religion by a person. It can also be defined within the broader context of embracing an opinion that i ...
, which is the explicit renunciation of one's religion, principles or cause; and from
blasphemy
Blasphemy is a speech crime and religious crime usually defined as an utterance that shows contempt, disrespects or insults a deity, an object considered sacred or something considered inviolable. Some religions regard blasphemy as a religio ...
, which is an impious utterance or action concerning God or sacred things.
Heresiology
In theology or the history of religion, heresiology is the study of heresy, and heresiographies are writings about the topic. Heresiographical works were common in both medieval Christianity and Islam.
Heresiology developed as a part of the emergi ...
is the study of heresy.
Etymology
Derived from
Ancient Greek
Ancient Greek includes the forms of the Greek language used in ancient Greece and the ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Dark Ages (), the Archaic p ...
''haíresis'' (), the English ''heresy'' originally meant "choice" or "thing chosen". However, it came to mean the "party, or school, of a man's choice", and also referred to that process whereby a young person would examine various philosophies to determine how to live.
The word ''heresy'' is usually used within a Christian, Jewish, or Islamic context, and implies slightly different meanings in each. The founder or leader of a heretical movement is called a ''
heresiarch
In Christian theology, a heresiarch (also hæresiarch, according to the ''Oxford English Dictionary''; from Greek: , ''hairesiárkhēs'' via the late Latin ''haeresiarcha''Cross and Livingstone, ''Oxford Dictionary of the Christian Church'' 1974 ...
'', while individuals who espouse heresy or commit heresy are known as ''heretics''.
Christianity

According to
Titus 3
Titus 3 is the third (and the last) chapter of the Epistle to Titus in the New Testament of the Christian Bible. The letter is traditionally attributed to Paul the Apostle, sent from Nicopolis of Macedonia (Roman province), addressed to Titus ...
:10 a divisive person should be warned twice before separating from him. The Greek for the phrase "divisive person" became a technical term in the early Church for a type of "heretic" who promoted dissension. In contrast, correct teaching is called sound not only because it builds up the faith, but because it protects it against the corrupting influence of false teachers.
Tertullian
Tertullian (; la, Quintus Septimius Florens Tertullianus; 155 AD – 220 AD) was a prolific early Christian author from Carthage in the Roman province of Africa. He was the first Christian author to produce an extensive corpus of ...
() implied that it was the Jews who most inspired heresy in Christianity: "From the Jew the heretic has accepted guidance in this discussion
Jesus was not the Christ."
The use of the word ''heresy'' was given wide currency by
Judaism's view of Jesus">Jesus was not the Christ."
The use of the word ''heresy'' was given wide currency by
in his 2nd-century tract ''On the Detection and Overthrow of the So-Called Gnosis">Contra Haereses'' (''Against Heresies'') to describe and discredit his opponents during the early centuries of the Christian community. He described the community's beliefs and doctrines as
orthodox (from , ''orthos'', "straight" or "correct" + , ''doxa'', "belief") and the Gnosticism">Gnostics
Gnosticism (from grc, γνωστικός, gnōstikós, , 'having knowledge') is a collection of religious ideas and systems which coalesced in the late 1st century AD among Judaism, Jewish and Early Christianity, early Christian sects. These ...
' teachings as heretical. He also pointed out the concept of apostolic succession to support his arguments.
[
Appendices provide a timeline of Councils, Schisms, Heresies and Persecutions in the years 193-604. They are described in the text.
]
Constantine the Great, who along with
Licinius
Valerius Licinianus Licinius (c. 265 – 325) was Roman emperor from 308 to 324. For most of his reign he was the colleague and rival of Constantine I, with whom he co-authored the Edict of Milan, AD 313, that granted official toleration to ...
had decreed toleration of Christianity in the Roman Empire by what is commonly called the
Edict of Milan
The Edict of Milan ( la, Edictum Mediolanense; el, Διάταγμα τῶν Μεδιολάνων, ''Diatagma tōn Mediolanōn'') was the February 313 AD agreement to treat Christians benevolently within the Roman Empire. Frend, W. H. C. ( ...
, and was the first Roman Emperor baptized, set precedents for later policy. By Roman law the Emperor was
Pontifex Maximus, the high priest of the
College of Pontiffs
The College of Pontiffs ( la, Collegium Pontificum; see '' collegium'') was a body of the ancient Roman state whose members were the highest-ranking priests of the state religion. The college consisted of the '' pontifex maximus'' and the other ...
(''Collegium Pontificum)'' of all recognized religions in
ancient Rome
In modern historiography, ancient Rome refers to Roman civilisation from the founding of the city of Rome in the 8th century BC to the collapse of the Western Roman Empire in the 5th century AD. It encompasses the Roman Kingdom (753–50 ...
. To put an end to the doctrinal debate initiated by
Arius, Constantine called the first of what would afterwards be called the
ecumenical council
An ecumenical council, also called general council, is a meeting of bishops and other church authorities to consider and rule on questions of Christian doctrine, administration, discipline, and other matters in which those entitled to vote are ...
s and then enforced orthodoxy by Imperial authority.
[
The Emperor established and enforced orthodoxy for domestic tranquility and the efficacy of prayers in support of the empire.]
The first known usage of the term in a legal context was in AD 380 by the
Edict of Thessalonica
The Edict of Thessalonica (also known as ''Cunctos populos''), issued on 27 February AD 380 by Theodosius I, made the Catholicism of Nicene Christians the state church of the Roman Empire.
It condemned other Christian creeds such as Arianism a ...
of
Theodosius I
Theodosius I ( grc-gre, Θεοδόσιος ; 11 January 347 – 17 January 395), also called Theodosius the Great, was Roman emperor from 379 to 395. During his reign, he succeeded in a crucial war against the Goths, as well as in two ...
,
[
As Christianity placed its stamp upon the Empire, the Emperor shaped the church for political purposes.] which made Christianity the
state church of the Roman Empire
Christianity became the official religion of the Roman Empire when Emperor Theodosius I issued the Edict of Thessalonica in 380, which recognized the catholic orthodoxy of Nicene Christians in the Great Church as the Roman Empire's state religion ...
. Prior to the issuance of this edict, the Church had no state-sponsored support for any particular legal mechanism to counter what it perceived as "heresy". By this edict the state's authority and that of the Church became somewhat overlapping. One of the outcomes of this blurring of Church and state was the sharing of state powers of legal enforcement with church authorities. This reinforcement of the Church's authority gave church leaders the power to, in effect, pronounce the death sentence upon those whom the church considered heretical.
Within six years of the official criminalization of heresy by the Emperor, the first Christian heretic to be executed,
Priscillian
Priscillian (in Latin: ''Priscillianus''; Gallaecia, - Augusta Treverorum, Gallia Belgica, ) was a wealthy nobleman of Roman Hispania who promoted a strict form of Christian asceticism. He became bishop of Ávila in 380. Certain practices of ...
, was condemned in 386 by Roman secular officials for sorcery, and put to death with four or five followers.
[Bassett, Paul M. 2013. "Priscillian." pp. 949–50 in ''Encyclopedia of Early Christianity'' (2nd ed.), edited by E. Ferguson. Routledge. ]
p. 950
However, his accusers were excommunicated both by Ambrose of Milan and by Pope Siricius, who opposed Priscillian's heresy, but "believed capital punishment to be inappropriate at best and usually unequivocally evil."
[ The edict of ]Theodosius II
Theodosius II ( grc-gre, Θεοδόσιος, Theodosios; 10 April 401 – 28 July 450) was Roman emperor for most of his life, proclaimed ''augustus'' as an infant in 402 and ruling as the eastern Empire's sole emperor after the death of his ...
(435) provided severe punishments for those who had or spread writings of Nestorius. Those who possessed writings of Arius were sentenced to death.
In the 7th-century text '' Concerning Heresy'', Saint John of Damascus
John of Damascus ( ar, يوحنا الدمشقي, Yūḥanna ad-Dimashqī; gr, Ἰωάννης ὁ Δαμασκηνός, Ioánnēs ho Damaskēnós, ; la, Ioannes Damascenus) or John Damascene was a Christian monk, priest, hymnographer, and a ...
named Islam as Christological heresy, referring to it as the "heresy of the Ishmaelites" (see '' medieval Christian views on Muhammad''). The position remained popular in Christian circles well into the 20th century, by theologians such as the Congregationalist cleric Frank Hugh Foster
Frank Hugh Foster, Ph. D., D.D. (June 19, 1851 – October 20, 1935) was an American clergyman of the Congregational church. He was born in Springfield, Massachusetts, and graduated at Harvard in 1873.
In his activities, he was assistant pr ...
and the Roman Catholic historian Hilaire Belloc
Joseph Hilaire Pierre René Belloc (, ; 27 July 187016 July 1953) was a Franco-English writer and historian of the early twentieth century. Belloc was also an orator, poet, sailor, satirist, writer of letters, soldier, and political activist. ...
, the latter describing it as "the great and enduring heresy of Mohammed."
For some years after the Reformation
The Reformation (alternatively named the Protestant Reformation or the European Reformation) was a major movement within Western Christianity in 16th-century Europe that posed a religious and political challenge to the Catholic Church and i ...
, Protestant churches were also known to execute those they considered heretics; for example, Michael Servetus
Michael Servetus (; es, Miguel Serveto as real name; french: Michel Servet; also known as ''Miguel Servet'', ''Miguel de Villanueva'', ''Revés'', or ''Michel de Villeneuve''; 29 September 1509 or 1511 – 27 October 1553) was a Spanish th ...
was declared a heretic by both the Reformed Church
Calvinism (also called the Reformed Tradition, Reformed Protestantism, Reformed Christianity, or simply Reformed) is a major branch of Protestantism that follows the theological tradition and forms of Christian practice set down by John Ca ...
and Catholic Church
The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with 1.3 billion baptized Catholics worldwide . It is among the world's oldest and largest international institutions, and has played a ...
for rejecting the Christian doctrine of the Holy Trinity
The Christian doctrine of the Trinity (, from 'threefold') is the central dogma concerning the nature of God in most Christian churches, which defines one God existing in three coequal, coeternal, consubstantial divine persons: God the ...
. The last known heretic executed by sentence of the Catholic Church was Spanish schoolmaster Cayetano Ripoll
Cayetano Ripoll ( ca, Gaietà Ripoll i Pla) (1778, in allegedly from Solsona – 26 July 1826, in Valencia) was a Spanish schoolmaster who was executed for teaching deist principles. He is considered to be the last known victim of the Spanish ...
in 1826. The number of people executed as heretics under the authority of the various "ecclesiastical authorities" is not known.
Although less common than in earlier periods, in modern times, formal charges of heresy within Christian churches still occur. Issues in the Protestant churches have included modern biblical criticism and the nature of God. In the Catholic Church, the Congregation for the Doctrine of the Faith
The Dicastery for the Doctrine of the Faith (DDF) is the oldest among the departments of the Roman Curia. Its seat is the Palace of the Holy Office in Rome. It was founded to defend the Catholic Church from heresy and is the body responsible ...
criticizes writings for "ambiguities and errors" without using the word "heresy."
Perhaps due to the many modern negative connotations associated with the term ''heretic'', such as the Spanish inquisition, the term is used less often today. The subject of Christian heresy opens up broader questions as to who has a monopoly on spiritual truth, as explored by Jorge Luis Borges
Jorge Francisco Isidoro Luis Borges Acevedo (; ; 24 August 1899 – 14 June 1986) was an Argentine short-story writer, essayist, poet and translator, as well as a key figure in Spanish-language and international literature. His best-known b ...
in the short story "The Theologians
"The Theologians" (original title: "Los teólogos") is a short story by Argentinian writer Jorge Luis Borges. It was featured in the collection '' Labyrinths''. It was originally published in ''Los Anales de Buenos Aires'' in April 1947 and appear ...
" within the compilation '' Labyrinths''.
On 11 July 2007, Pope Benedict XVI stated that some Protestant groups are "ecclesial communities" rather than Churches. Representatives of some of these Christian denominations accused the Vatican of effectively calling them heretics. However, Pope BenedictXVI clarified that the phrase "ecclesial community" did not necessitate explicit heresy, but only that the communities lacked certain "essential elements" of an apostolic church, as he had written in the document Dominus Iesus
( en, The Lord Jesus) is a declaration by the Congregation for the Doctrine of the Faith (previously known as the "Holy Office"), approved in a plenary meeting of the Congregation and signed by its then prefect, Joseph Cardinal Ratzinger (later ...
.
Catholicism
In the Catholic Church
The Catholic Church, also known as the Roman Catholic Church, is the largest Christian church, with 1.3 billion baptized Catholics worldwide . It is among the world's oldest and largest international institutions, and has played a ...
, obstinate and willful manifest heresy is considered to spiritually cut one off from the Church, even before excommunication
Excommunication is an institutional act of religious censure used to end or at least regulate the communion of a member of a congregation with other members of the religious institution who are in normal communion with each other. The purpose ...
is incurred. The ''Codex Justinianus
The Code of Justinian ( la, Codex Justinianus, or ) is one part of the ''Corpus Juris Civilis'', the codification of Roman law ordered early in the 6th century AD by Justinian I, who was Eastern Roman emperor in Constantinople. Two other units, ...
'' (1:5:12) defines "everyone who is not devoted to the Catholic Church and to our Orthodox holy Faith" a heretic.[ The Church had always dealt harshly with strands of Christianity that it considered heretical, but before the 11th century these tended to centre on individual preachers or small localised sects, like ]Arianism
Arianism ( grc-x-koine, Ἀρειανισμός, ) is a Christological doctrine first attributed to Arius (), a Christian presbyter from Alexandria, Egypt. Arian theology holds that Jesus Christ is the Son of God, who was begotten by G ...
, Pelagianism
Pelagianism is a Christian theological position that holds that the original sin did not taint human nature and that humans by divine grace have free will to achieve human perfection. Pelagius ( – AD), an ascetic and philosopher from t ...
, Donatism
Donatism was a Christian sect leading to a schism in the Church, in the region of the Church of Carthage, from the fourth to the sixth centuries. Donatists argued that Christian clergy must be faultless for their ministry to be effective and ...
, Marcionism
Marcionism was an early Christian dualistic belief system that originated with the teachings of Marcion of Sinope in Rome around the year 144. Marcion was an early Christian theologian, evangelist, and an important figure in early Christian ...
and Montanism
Montanism (), known by its adherents as the New Prophecy, was an early Christian movement of the late 2nd century, later referred to by the name of its founder, Montanus. Montanism held views about the basic tenets of Christian theology sim ...
. The diffusion of the almost Manichaean
Manichaeism (;
in New Persian ; ) is a former major religionR. van den Broek, Wouter J. Hanegraaff ''Gnosis and Hermeticism from Antiquity to Modern Times''SUNY Press, 1998 p. 37 founded in the 3rd century AD by the Parthian prophet Mani (A ...
sect of Paulician
Paulicianism (Classical Armenian: Պաւղիկեաններ, ; grc, Παυλικιανοί, "The followers of Paul"; Arab sources: ''Baylakānī'', ''al Bayāliqa'' )Nersessian, Vrej (1998). The Tondrakian Movement: Religious Movements in the ...
s westwards gave birth to the famous 11th- and 12th-century heresies of Western Europe. The first one was that of Bogomils
Bogomilism ( Bulgarian and Macedonian: ; sh-Latn-Cyrl, separator=" / ", bogumilstvo, богумилство) was a Christian neo-Gnostic or dualist sect founded in the First Bulgarian Empire by the priest Bogomil during the reign of Tsar Pet ...
in modern-day Bulgaria, a sort of sanctuary between Eastern and Western Christianity. By the 11th century, more organised groups such as the Patarini, the Dulcinian
{{no footnotes, date=July 2018
The Dulcinians were a religious sect of the Late Middle Ages, originating within the Apostolic Brethren. The Dulcinians, or Dulcinites, and Apostolics were inspired by Franciscan ideals and influenced by the Joachim ...
s, the Waldensians
The Waldensians (also known as Waldenses (), Vallenses, Valdesi or Vaudois) are adherents of a church tradition that began as an ascetic movement within Western Christianity before the Reformation.
Originally known as the "Poor Men of Lyon" in ...
and the Cathars
Catharism (; from the grc, καθαροί, katharoi, "the pure ones") was a Christian Dualistic cosmology, dualist or Gnosticism, Gnostic movement between the 12th and 14th centuries which thrived in Southern Europe, particularly in northern ...
were beginning to appear in the towns and cities of northern Italy, southern France and Flanders.
In France the Cathars grew to represent a popular mass movement and the belief was spreading to other areas. The Cathar Crusade
The Albigensian Crusade or the Cathar Crusade (; 1209–1229) was a military and ideological campaign initiated by Pope Innocent III to eliminate Catharism in Languedoc, southern France. The Crusade was prosecuted primarily by the French crown ...
was initiated by the Catholic Church to eliminate the Cathar heresy in Languedoc
The Province of Languedoc (; , ; oc, Lengadòc ) is a former province of France.
Most of its territory is now contained in the modern-day region of Occitanie in Southern France. Its capital city was Toulouse. It had an area of approximatel ...
.[
] Heresy was a major justification for the Inquisition
The Inquisition was a group of institutions within the Catholic Church whose aim was to combat heresy, conducting trials of suspected heretics. Studies of the records have found that the overwhelming majority of sentences consisted of penances, ...
(''Inquisitio Haereticae Pravitatis'', Inquiry on Heretical Perversity) and for the European wars of religion
The European wars of religion were a series of wars waged in Europe during the 16th, 17th and early 18th centuries. Fought after the Protestant Reformation began in 1517, the wars disrupted the religious and political order in the Catholic cou ...
associated with the Protestant Reformation
The Reformation (alternatively named the Protestant Reformation or the European Reformation) was a major movement within Western Christianity in 16th-century Europe that posed a religious and political challenge to the Catholic Church and in ...
.
Galileo Galilei
Galileo di Vincenzo Bonaiuti de' Galilei (15 February 1564 – 8 January 1642) was an Italian astronomer, physicist and engineer, sometimes described as a polymath. Commonly referred to as Galileo, his name was pronounced (, ). He w ...
was brought before the Inquisition for heresy, but abjured
Abjuration is the solemn repudiation, abandonment, or renunciation by or upon oath, often the renunciation of citizenship or some other right or Privilege (legal ethics), privilege. The term comes from the Latin ''abjurare'', "to forswear".
Abj ...
his views and was sentenced to house arrest
In justice and law, house arrest (also called home confinement, home detention, or, in modern times, electronic monitoring) is a measure by which a person is confined by the authorities to their residence. Travel is usually restricted, if ...
, under which he spent the rest of his life. Galileo was found "vehemently suspect of heresy", namely of having held the opinions that the Sun lies motionless at the centre of the universe
The universe is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy. The Big Bang theory is the prevailing cosmological description of the development of the universe. A ...
, and that the Earth is not at its centre and moves, and that one may hold and defend an opinion as probable after it has been declared contrary to Holy Scripture. He was required to "abjure, curse and detest" those opinions.
Pope Gregory I
Pope Gregory I ( la, Gregorius I; – 12 March 604), commonly known as Saint Gregory the Great, was the bishop of Rome from 3 September 590 to his death. He is known for instigating the first recorded large-scale mission from Rome, the Gregori ...
stigmatized Judaism and the Jewish people in many of his writings. He described Jews as enemies of Christ: "The more the Holy Spirit
In Judaism, the Holy Spirit is the divine force, quality, and influence of God over the Universe or over his creatures. In Nicene Christianity, the Holy Spirit or Holy Ghost is the third person of the Trinity. In Islam, the Holy Spirit acts ...
fills the world, the more perverse hatred dominates the souls of the Jews." He labeled all heresy as "Jewish", claiming that Judaism would "pollute atholics anddeceive them with sacrilegious seduction." The identification of Jews and heretics in particular occurred several times in Roman-Christian law.
Eastern Orthodoxy
In Eastern Orthodox Christianity
Eastern Orthodoxy, also known as Eastern Orthodox Christianity, is one of the three main branches of Chalcedonian Christianity, alongside Catholicism and Protestantism.
Like the Pentarchy of the first millennium, the mainstream (or " canoni ...
heresy most commonly refers to those beliefs declared heretical by the first seven Ecumenical Councils. Since the Great Schism and the Protestant Reformation
The Reformation (alternatively named the Protestant Reformation or the European Reformation) was a major movement within Western Christianity in 16th-century Europe that posed a religious and political challenge to the Catholic Church and in ...
, various Christian churches have also used the concept in proceedings against individuals and groups those churches deemed heretical.
The Eastern Orthodox Church
The Eastern Orthodox Church, also called the Orthodox Church, is the second-largest Christian church, with approximately 220 million baptized members. It operates as a communion of autocephalous churches, each governed by its bishops vi ...
also rejects the early Christian heresies such as Arianism
Arianism ( grc-x-koine, Ἀρειανισμός, ) is a Christological doctrine first attributed to Arius (), a Christian presbyter from Alexandria, Egypt. Arian theology holds that Jesus Christ is the Son of God, who was begotten by G ...
, Gnosticism
Gnosticism (from grc, γνωστικός, gnōstikós, , 'having knowledge') is a collection of religious ideas and systems which coalesced in the late 1st century AD among Judaism, Jewish and Early Christianity, early Christian sects. These ...
, Origenism
Origenism refers to a set of beliefs attributed to the Christian theologian Origen. The main principles of Origenism includes allegorical interpretation of scripture and subordinationism. Origen's thought was influenced by Philo the Jew, Platonis ...
, Montanism
Montanism (), known by its adherents as the New Prophecy, was an early Christian movement of the late 2nd century, later referred to by the name of its founder, Montanus. Montanism held views about the basic tenets of Christian theology sim ...
, Judaizers
The Judaizers were a faction of the Jewish Christians, both of Jewish and non-Jewish origins, who regarded the Levitical laws of the Old Testament as still binding on all Christians. They tried to enforce Jewish circumcision upon the Gentile co ...
, Marcionism
Marcionism was an early Christian dualistic belief system that originated with the teachings of Marcion of Sinope in Rome around the year 144. Marcion was an early Christian theologian, evangelist, and an important figure in early Christian ...
, Docetism
In the history of Christianity, docetism (from the grc-koi, δοκεῖν/δόκησις ''dokeĩn'' "to seem", ''dókēsis'' "apparition, phantom") is the heterodox doctrine that the phenomenon of Jesus, his historical and bodily existence, an ...
, Adoptionism,