The Duke of Chevreuse, Charles de Lorraine, gained ownership of the fort in 1612 and by the end of the 17th century, the Citadel of lle Sainte Marguerite turned into a state prison and barracks.
The Man in the Iron Mask arrived at the Citadel of lle Sainte Marguerite in1687 and stayed on the island until 1698. He died in 1703 after being moved to the Bastille in Paris. The name of the Man in the Iron Mask was Eustache Dauger , however the story behind Dauger’s identity remains unknown. Rumors suggest that Eustache Dauger was the illegitimate brother of Louis XIV.
The Citadel of lle Sainte Marguerite represents the Alcatraz of the 17th century. In fact, the only prisoner to escape was Marshal Bazaine, later surrendering to the Prussians during the Franco Prussian War. Bazaine was sentenced to 20 years of exile in 1873, and later managed to escape one year later to Italy.
Now home to a youth hostel and museum, the cells still survive including that of the Man in the Iron Mask.
Citadel of lle Sainte Marguerite Picture Source