Definition
In English law, heresy was a criminal offense against religion consisting not in a total denial of Christianity but in the public and obstinate avowal of opinions contrary to some of its essential doctrines. The key elements distinguishing heresy from apostasy or blasphemy were the partial nature of the doctrinal deviation, the public profession of it, and the willful persistence in maintaining it despite correction.
At its height as a secular crime, heresy was capital. Conviction could result in burning at the stake under the writ de haeretico comburendo. By the later common law period, the offense had been significantly curtailed and transferred almost entirely to ecclesiastical jurisdiction. In modern English law, heresy carries no criminal sanction and is exclusively a matter of church discipline, if anything at all.
In American law, heresy has no standing as a legal offense. The First Amendment's religion clauses and the constitutional prohibition on religious tests for public office effectively preclude any civil or criminal legal consequence attaching to religious heterodoxy.
Common Language
Modern common usage (Wiktionary): A doctrine held by a member of a religion at variance with established religious beliefs; also, any controversial or unorthodox opinion held within a group, as in politics, philosophy, or science.
Historical common usage (Webster's 1913): An opinion held in opposition to established or commonly received doctrine, tending to promote division or faction — used in politics, literature, and philosophy, not only religion, and often with a tone of reproach.
The gap between common and legal meaning is significant and runs in both directions. Ordinary usage has always been broader than the legal definition, extending "heresy" metaphorically to any field of thought. The legal definition was technically narrower and more precise: it required a Christian doctrinal context, public avowal, and obstinacy — a mere private doubt or philosophical heterodoxy did not qualify. Researchers reading historical legal sources must resist importing the loose common meaning; conversely, those reading historical theological or political tracts must recognize that "heresy" there carries none of the legal precision the law required.
Common Confusion
Heresy is frequently confused with two related offenses:
Blasphemy involves contemptuous, profane, or scurrilous attacks on God, Christianity, or sacred subjects. Heresy is more specific: it concerns the obstinate maintenance of doctrinally incorrect belief, not the manner or tone of expression. A blasphemer insults; a heretic dissents.
Apostasy is the total abandonment of Christianity. The historical law of heresy expressly excluded apostasy from its scope — heresy required partial, not total, rejection of doctrine. Apostasy was treated as a separate and in some periods graver offense.
Why It Matters in Research
Heresy is a term of largely extinct legal application, but it appears throughout English legal history in ways that require careful navigation.
Temporal scope is everything. Heresy as a capital secular crime effectively ended in England with the abolition of de haeretico comburendo in 1677. Sources before that date describe a very different legal landscape than sources after. Black's and Bouvier's entries, while accurate for their summaries, compress this history in ways that can mislead a researcher into underestimating how serious and actively prosecuted the offense once was.
Jurisdiction shifted over time. Before the Reformation, heresy prosecutions were driven by ecclesiastical courts with secular enforcement of the sentence. After the Reformation, the Crown assumed greater direct authority. After the seventeenth century, the offense reverted to purely ecclesiastical correction. A researcher must determine which period and which jurisdictional arrangement applies before drawing conclusions from any primary source.
American researchers will rarely encounter heresy as an operative legal concept in domestic sources, but they may encounter it in colonial-era materials, in church governance disputes, or in First Amendment scholarship examining how the constitutional framers understood the state's prior relationship to religious heterodoxy. In that context, heresy's legal history is essential background.
Corpus connections: Sources discussing the Statute of 2 Henry IV, c. 15 (defining heretics and authorizing burning) and the later repeal of the writ de haeretico comburendo are the primary legislative anchors. Blackstone's Commentaries (Book IV, ch. 4) and Hale's Pleas of the Crown are the classical treatise sources and are the authorities cited by the historical dictionaries.
Historical Dictionary Support
The four source dictionaries are consistent in their core account but differ in emphasis and depth.
Black's Law Dictionary (both editions) provides the most complete picture, drawing on Blackstone and Hale for the dual characterization of heresy as both a public doctrinal offense and an opinion "devised by human reason, openly taught, and obstinately maintained." Both editions note that the offense is no longer punishable by temporal courts — an important editorial signal that the entry describes a historical rather than current legal category.
Bouvier's adds the significant detail of the Statute of 2 Henry IV, c. 15, which gave the ecclesiastical courts authority to define and determine heresy and provided the statutory basis for the burning of heretics. Bouvier's is therefore the most useful of the four for a researcher tracing the legislative history of the offense.
Anderson's Dictionary of Law offers nothing substantive, redirecting the reader to see "RELIGION" — a reminder that some historical dictionaries are better used as indices than as authorities.
All four dictionaries treat heresy primarily as English law. None addresses American law, which is appropriate: the offense had no American legal life. What the dictionaries do not capture is the rich jurisdictional conflict between ecclesiastical and secular courts that characterized heresy prosecution throughout the medieval and early modern periods, nor the Reformation's profound effect on who had authority to define heresy at all.
Jurisdictional Note
Heresy as a punishable legal offense is a feature of English legal history, not American law. In the United States, the First Amendment forecloses any governmental role in adjudicating religious correctness. In contemporary England and most common law jurisdictions, heresy carries no civil or criminal legal consequence. Researchers working in canon law or the internal governance of religious institutions may still encounter heresy as a disciplinary category, but this operates entirely outside the civil legal system.
Encyclopedia Cross-Reference
See Law Mind Encyclopedia — Ecclesiastical Law; Religious Offenses in English Legal History; Blasphemy (English Law)