A genealogical thumbnail for her is here. Her mother, Gabrielle de Rochechouart de Mortemart, was the older sister of royal mistress Mme. de Montespan. She married Philippe Jules Mancini who came to France with his five famous sisters.
From the lost gallery's photostream on flickr.
Coiffures are rising and need ornamentation, done here with one or more ribbons. Fripon curls appear eith the high coiffure. Mme. Diane Gabrielle is not a classic beauty, but is very handsome, dignified, and feminine in her dress for this 1682-3 Mignard portrait.
Keywords: 1682, Mignard, Diane Gabrielle Damas de Thianges, Duchesse de Nevers, Damas de Thianges family, Mancini family, Duchess, French, long high curly coiffure, ribbon headdress, chemise, modesty piece, lace, trapezoidal neckline, elbow length full under-sleeves, cuffs, laced bodice, quarter length notched full over-sleeves, lining, girdle, vee waistline, clasps, wrap