Mystery AtlasThe Eustache Dauger Theory
The leading historical candidate: a valet named Eustache Dauger, arrested in 1669 and imprisoned for what official documents describe only as knowledge of some prior employment, not for who he was.
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Related Mysteries
- The Man in the Iron Mask1669-1703
The Eustache Dauger Theory attempts to explain The Man in the Iron Mask.
Theories & Explanations
The Eustache Dauger Theory contradicts The Ercole Mattioli Theory — The Dauger reading treats the prisoner as a low-status valet jailed for what he knew; the Mattioli reading rests on the burial register name 'Marchioly' and casts him as a disgraced diplomat, an identity of a different order entirely.