Marie Delphine Macarty or MacCarthy (March 19, 1787 – December 7, 1849), more commonly known as Madame Blanque, until her third marriage, when she became known as Madame LaLaurie, was a New Orleans Creole socialite and serial killer who tortured and murdered slaves in her household.
Born during the Spanish colonial period, Delphine Macarty married three times in Louisiana, and was twice widowed.
She maintained her position in New Orleans society until April 10, 1834, when rescuers responded to a fire at her Royal Street mansion.
They discovered bound slaves in her attic who showed evidence of cruel, violent abuse over a long period.
LaLaurie's house was subsequently sacked by an outraged mob of New Orleans citizens.
She escaped to France with her family.The mansion traditionally held to be LaLaurie's is a landmark in the French Quarter, in part because of its history and for its architectural significance.
However, her house was burned by the mob, and the "LaLaurie Mansion" at 1140 Royal Street was in fact rebuilt after her departure from New Orleans.