Fate: Condemned by the Council of Arles (314 AD) and by Constantine, who exiled Donatist bishops and handed their basilicas to Catholic bishops. Imperial coercion largely failed — Donatism remained the majority church in North Africa for decades. Augustine spent enormous energy refuting and suppressing it. The Circumcellions (Donatist paramilitaries) attacked Catholic clergy. The Vandal invasion (~429 AD) disrupted both communities; the Arab conquest (~698 AD) ended North African Christianity entirely, Donatist and Catholic alike.

The Donatist controversy begins with a practical crisis: during the Great Persecution under Diocletian (303–311 AD), many clergy — including some who became bishops afterward — had handed over (traditio — the root of ‘traitor’) scriptures to Roman authorities to save their lives. These clergy were called traditores. When Caecilian was consecrated Bishop of Carthage (~311 AD), Donatists objected that one of his consecrators had been a traditor — making the consecration invalid and all sacraments performed by Caecilian’s church invalid. Donatus Magnus led the schism. The theological issue is the holiness of the church: is sacramental validity dependent on the moral worthiness of the minister (Donatist position) or is it objective and independent of the minister’s character (Catholic position, articulated by Augustine as ex opere operato — ‘from the work performed’)? Augustine’s answer won — and shapes Catholic sacramental theology to this day. His justification of imperial coercion against the Donatists also becomes the template for later inquisitorial logic.

What happens when a group is declared heretical: The process is rarely sudden. It typically begins with episcopal letters condemning a teaching, escalates to synodal condemnation at a regional council, and — after Constantine — can be ratified by an ecumenical council backed by imperial authority. Once condemned: (1) Leaders are excommunicated, exiled, or — in later centuries — handed to secular authorities for execution. (2) Writings are ordered burned; possession becomes a criminal offense. Eusebius records that after Nicaea, Constantine ordered Arian books destroyed under penalty of death. The same logic applied to Gnostic texts — which is why the Nag Hammadi library was buried in a sealed jar around 367 AD, the same year Athanasius’s Easter letter listed the NT canon and ordered non-canonical books removed from churches. (3) Communities are dissolved by force where state power reaches; in regions beyond imperial reach they survive for centuries. (4) Memory is controlled — the only surviving accounts of most heresies are hostile summaries by their opponents (Irenaeus, Tertullian, Epiphanius’s Panarion), meaning we are largely reading prosecution briefs, not the groups’ own self-understanding.