About Blanche Monnier
Blanche Monnier (French pronunciation: [blɑ̃ʃ mɔnje]; 1 March 1849 – 13 October 1913), often known in France as la Séquestrée de Poitiers (roughly, "The Confined Woman of Poitiers"), was a woman from Poitiers, France, who was secretly kept locked in a small room by her aristocratic mother and brother for 25 years. She was eventually found by police, then middle-aged and in emaciated and filthy condition; according to officials, Monnier had not seen any sunlight for her entire captivity. Once a young and well-regarded member of society, Blanche was now 52 years old and had endured 25 years in captivity before finally being discovered. Marcel Monnier identified her as his sister, Blanche Monnier. Louise Monnier was arrested, became ill shortly afterwards and died 15 days later, after seeing an angry mob gather in front of her house. Louise and Marcel continued on with their daily lives, pretending to mourn Blanche's disappearance.
Biography source: Wikipedia. The profile adds birthday-specific historical context from the Celebs Birthday Today editorial database.