["Journal of Historical Sociology, Volume 34, Issue 3, Page 452-465, September 2021. ", "\nAbstract\nFourth Century North Africa was a site of intense religious and political conflict. Emerging from a period of persecution and newly legitimized by the Roman state, the Christian Church immediately fractured into two competing camps. Now known as the Donatist schism, this fracture was the result of competing claims to religious authority between two camps of bishops, but the doctrinal debate at its core precipitated a specific form of violence: attacks on clergy and property perpetrated by roving groups of militant bandits. Known as circumcellions, these bands acquired a perverse reputation for religious zeal, a desire for martyrdom, and what their opponents described as the ‘madness’ and ‘insanity’ of their violence. Here I analyze sources produced by both Donatists and Catholics to trace patterns of circumcellion violence. I draw on borderland theory and research on non‐state violence to argue that such acts were not mad, but rather the result of strategic efforts to consolidate religious and political power. In this, Donatism and the sectarian violence that accompanied it provide important insights into how banditry and peasant rebellions can serve as alternate sources of social and political power, avenues through which heterodox movements challenge the power state and religious hierarchies alike.\n"]