Editing Man in the Iron Mask (section)

====King's younger brother====
In 1791, Jean Baptiste De Saint-Mihiel proposed that the prisoner was an illegitimate younger brother of Louis XIV, fathered by [[Cardinal Mazarin]].{{sfn|Mongrédien|1961|p=51}} This theory was based on the fact, mentioned by Voltaire in {{lang|fr|Questions sur l'Encyclopédie}} (1771), that the prisoner had told his doctor that he "believed himself to be about 60 years old", a few days before his death in 1703. De Saint-Mihiel extrapolated that the prisoner was therefore born around 1643, and could therefore only be a younger brother to the King, born in 1638.{{sfn|Petitfils|2004|pp=224–225}} It is a historical fact that, four days after Louis XIII's death on 14 May 1643, the Queen was declared Regent and appointed Mazarin as her chief minister and head of government that evening.{{sfn|Dethan|1959|pp=50–51}} Mazarin was soon believed to be her lover, and even her secret [[Morganatic marriage|morganatic husband]].{{sfn|Treasure|1984|pp=216–217}} The theory of the prisoner being an imagined, younger son of the Queen and Mazarin was rekindled in 1868 by Charles-Henri, baron de Gleichen.{{sfn|Gleichen|1868||pp=46–50}}{{sfn|Mongrédien|1961|p=51}}