Case file · High strangeness
The Man in the Iron Mask
A prisoner arrested in 1669 under the name 'Eustache Dauger' was held for 34 years, his face hidden by a velvet mask, at Pignerol, Sainte-Marguerite island and the Bastille, where he died in 1703.
1669 CE · 43.52, 7.05 · status: unexplained
The account
Voltaire and Dumas made him Louis XIV's twin. His cell on Sainte-Marguerite off Cannes is shown to visitors.
The sceptical view
Historians favour a valet who knew state secrets; the mask was velvet, not iron.
The researched reading
A real state prisoner, most likely a valet who knew too much, made famous by gaolers’ rumours and novelists. It is a historical puzzle about identity, with nothing beyond that.
| Explanation | Weight | Why |
|---|---|---|
| Undetermined | 45% | The share the reading had given to fabrication on doubt rather than evidence: the record does not settle it either way. |
| A cultural story | 40% | The prison records are real and show a prisoner named Eustache Dauger, most likely a valet who had seen something compromising. Voltaire and Dumas turned the velvet mask into an iron one and the valet into a royal twin. |
| A hoax or fabrication | 5% | The jailer Saint-Mars appears to have encouraged rumours about his important prisoner to raise his own standing. That was deliberate mystification at the time. |
| A known natural phenomenon | 3% | Nothing natural is in question. |
| Perception, memory or mind | 3% | Later witnesses’ memories of the mask grew more dramatic with time. |
| Something in the surroundings | 2% | Not applicable. |
| Genuinely anomalous | 2% | His identity is uncertain, but nothing about the case is inexplicable. |
Official position: Historians generally identify him as Eustache Dauger, a valet imprisoned for what he knew.