The Jansenist Convulsionnaires of Saint-Medard

Francois de Paris was a Jansenist deacon who died in 1727, having devoted himself to extreme asceticism. Jansenism was a dissident Catholic reform movement at war with the Jesuits and the papacy; its adherents were politically charged and their martyrology was motivated. Almost immediately after Paris's burial at Saint-Medard, pilgrims began reporting miraculous cures at his tomb. Within months, some pilgrims fell into violent convulsions — thrashing, contorting, and performing feats of apparent invulnerability. Crowds of thousands descended on the cemetery.

The documentation is remarkable by any pre-modern standard. Jansenist lawyers organized formal depositional campaigns; physicians examined patients before and after reported cures. The most discussed case was the reported healing of a woman whose breast had been destroyed by cancer, with physicians attesting to the condition beforehand and afterward. Cardinal Noailles initially endorsed some miracles; Archbishop Vintimille condemned the whole movement as satanic fraud. The king closed the cemetery in 1732, prompting the famous graffito: "By royal order: God is forbidden to work miracles here."

David Hume devoted the central example of his essay "Of Miracles" (1748, Enquiry Concerning Human Understanding) to Saint-Medard. He argued that the Jansenist miracles were better attested by contemporary educated witnesses than virtually any ancient miracle claim — and yet no Protestant believed them. His rhetorical gambit was to force Protestant readers to articulate why they rejected Jansenist testimony while accepting biblical testimony, then apply that standard consistently.

The natural explanation involves conversion disorder (formerly "hysteria"), a well-documented syndrome in which psychological distress produces genuine physical symptoms and recoveries; mass social contagion; and selective documentation of successes. The escalation of the convulsions into extreme theatrical violence over the 1730s follows the curve of social hysteria, not healing ministry.