Pelagianism is a theological position, originating in the early fifth century, holding that human beings possess the natural capacity to choose good and avoid sin without requiring divine grace as a precondition for moral action. Named after the British monk Pelagius (c. 354-c. 420), the position was developed in Rome and Carthage in response to what its proponents regarded as moral quietism among Christians. The definition of Pelagianism is itself contested: critics, beginning with Augustine of Hippo, applied the label broadly to any doctrine minimizing the necessity of grace, while defenders of Pelagius have argued that the positions attributed to him were misrepresented or condemned on political rather than theological grounds. For treatment of these competing characterizations, see pelagianism-augustine-characterization-viewpoint-debate.

Pelagianism was condemned at the Council of Carthage (418) and reaffirmed as heretical at the Council of Ephesus (431). In Western Christian theology, particularly within Catholic and Reformed traditions, the condemnation is treated as settled doctrinal history. Scholarly debate continues, however, on several distinct questions: whether surviving texts accurately represent Pelagius's own views rather than those of associates such as Caelestius; the degree to which Augustine's polemical writings shaped the historical record against Pelagius; and whether later theological positions labeled “semi-Pelagian”-attributed to figures such as John Cassian-constitute a meaningfully distinct category or merely a rhetorical device in later confessional disputes.

In academic patristics and historical theology, reassessment of Pelagius's actual writings-particularly his Commentary on the Epistles of Paul-has led a number of scholars to argue for a more moderate reading of his views on grace than the Augustinian polemical tradition allows. The extent to which Pelagianism remains a live theological option, as opposed to a heresiological category, varies considerably across Christian denominations and scholarly frameworks.

- Pelagianism as condemned heresy: The dominant position in Western Catholic and Reformed theology holds that Pelagianism fundamentally misrepresents the human condition by denying original sin and the necessity of prevenient grace. This view relies heavily on Augustine's account and the conciliar record. See pelagianism-heresy-viewpoint.

- Rehabilitationist reading of Pelagius: A scholarly minority argues that Pelagius was a moderate moralist whose actual positions were distorted by Augustine's controversy with Caelestius, and that the condemnation reflects ecclesiastical politics as much as theological substance. See pelagianism-rehabilitation-viewpoint.

- Pelagianism as implicit in Arminian and Wesleyan traditions: Some Calvinist theologians argue that any theology affirming libertarian free will and resistible grace is functionally Pelagian, a claim disputed by Arminian scholars who distinguish their position from classical Pelagianism. See pelagianism-arminian-viewpoint-debate.

- Secular and humanist reading: From outside the theological tradition, Pelagius's emphasis on human moral agency and responsibility has been interpreted as an early assertion of human autonomy compatible with naturalistic ethics. See pelagianism-secular-humanist-viewpoint.

- The condemnation of Pelagius at Carthage and Ephesus: The procedural and theological fairness of the conciliar condemnations, including Augustine's role in securing them, has been disputed by historians of the early Church. See pelagianism-council-condemnation-controversy.

- Semi-Pelagianism and the Second Council of Orange (529): The subsequent condemnation of positions associated with John Cassian and other Gallic monks raised contested questions about the boundary between orthodox and heretical teachings on grace and free will. See pelagianism-semi-pelagian-orange-controversy.

- pelagianism-history - Augustine of Hippo - Original Sin Viewpoint - Doctrine of Justification - pelagianism-heresy-viewpoint - pelagianism-rehabilitation-viewpoint - pelagianism-secular-humanist-viewpoint - pelagianism-arminian-viewpoint-debate - pelagianism-augustine-characterization-viewpoint-debate - pelagianism-council-condemnation-controversy - pelagianism-semi-pelagian-orange-controversy - Original Sin - divine-grace - Free Will

1. Brinley Roderick Rees, Pelagius: A Reluctant Heretic (Woodbridge: Boydell Press, 1988). 2. Gerald Bonner, St. Augustine of Hippo: Life and Controversies (London: SCM Press, 1963; rev. ed. Norwich: Canterbury Press, 1986). 3. J. Patout Burns, “Augustine's Role in the Imperial Action Against Pelagius,” Journal of Theological Studies 30, no. 1 (1979): 67-83. 4. Theodore de Bruyn, trans., Pelagius's Commentary on St Paul's Epistle to the Romans (Oxford: Clarendon Press, 1993). 5. John Ferguson, Pelagius: A Historical and Theological Study (Cambridge: W. Heffer & Sons, 1956). 6. Rebecca Harden Weaver, Divine Grace and Human Agency: A Study of the Semi-Pelagian Controversy (Macon, GA: Mercer University Press, 1996). 7. Peter Brown, Augustine of Hippo: A Biography (London: Faber and Faber, 1967; new ed. Berkeley: University of California Press, 2000), chaps. 29-31.