Clémence Elise Marie Jeanne "Pata" de Montagnac (16 April 1882 – 27 June 1966), later known as Madame Maximilian von Jaunez and Comtesse Charles de Polignac, was a French socialite, salonnière, arts patron, and singer.

[2] Her father-in-law, Édouard, was also a politician who was elected as mayor of Sarreguemines, served as president of the Alsace-Lorraine Landesausschuss, and represented Lorraine in the Reichstag.

[2] The Jaunez family was elevated to the Prussian nobility in 1904, granting them the right to use the nobiliary particle von in their surname.

[2][6] She was instrumental in Princess Edmond's commissioning of Francis Poulenc's Concerto for Two Pianos and Orchestra in D Minor.

[2] As a close friend of Poulenc, she received numerous signed copies of his music as gifts.

[2] De Montagnac was a musician herself, and performed as a dilettante singer with Richard Strauss and at the salons of Marguerite de Saint Marceaux, which were frequented by Giovanni Boldini, Maurice Ravel, Gabriel Fauré, Jacques-Émile Blanche, and Colette.

[2] In 1925, she suffered a vocal cord injury and stopped performing, but remained involved in musical circles.