Case file · High strangeness
The possessed nuns of San Plácido
From 1625 nuns of the Benedictine convent of San Plácido in Madrid showed signs of demonic possession; in 1628 the Inquisition arrested the abbess and the confessor.
1628 CE · 40.42, -3.71 · status: official
The researched reading
A convent possession steered by its confessor and fed by the expectations of enclosed religious life. Contagious behaviour and manipulation explain it well.
| Explanation | Weight | Why |
|---|---|---|
| Perception, memory or mind | 40% | Some 25 of 30 nuns of a newly founded, intensely devotional enclosed convent fell into fits once one sister was declared possessed; enclosed communities under strict spiritual direction are the textbook setting for contagious possession, as at Loudun a few years later. |
| A cultural story | 25% | Court politics (the convent’s patron was close to the Count-Duke of Olivares) and the Spanish theology of possession and alumbrados shaped how the episode was read and later retold. |
| A hoax or fabrication | 22% | The Inquisition concluded that the confessor Francisco García Calderón had steered the "demons" into prophecy and illuminist doctrine; manipulation by a spiritual director is well supported by the trial. |
| Undetermined | 5% | The share a generic explanation had beyond what has been shown for this case: it fits many cases like this one, but has not been demonstrated for this one. |
| A known natural phenomenon | 4% | Individual illness may have started the first episode, but no physical disease is recorded. |
| Genuinely anomalous | 3% | Even the Inquisition came to treat the affair as error and manipulation rather than straightforward demonic action. |
| Something in the surroundings | 1% | Nothing suggests a physical cause in the building. |
Official position: The Inquisition arrested the abbess and the confessor in 1628 and condemned the confessor for heresy; the nuns were later rehabilitated.