"Madame de Montespan (1640-1707) as Diana", Pierre Mignard I, between 1675 and 1700
So-called portrait of madame de montespan (1640-1707), but it’s probably a depiction of marie anne de bourbon (1666-1739), daughter of louis xiv of france and louise de la vallière
identification made by ecummenic based on the comparison with some portraits of that princess (see images below). Object Type: painting. Genre: portrait. Date: between 1675 and 1700. Dimensions: 46 3/8 x 63 1/2 in. Medium: oil on canvas. Collection: Unidentified location. Attributed to Pierre Mignard - So-called Madame de Montespan (1640-1707) as Diana