I can provide you just a little information, Polignac.
I´m sure you know that Aglae of Polignac was a daughter of Jules François Armand, first Duke of Polignac, by his wife, Yolande Martine Gabrielle de Polastron. Aglae was born on 7 May 1768. When Aglae was so young, on 11 July 1780, was married, at Versailles, with Antoine de Gramont, duke of Guiche and Gramont. Aglae has a dowry of 800.000 livres, a wondreous amount of money provided by king Louis XVI; after the wedding, the girl was nicknamed "Guichette" by her relatives.
Aglae was delivered by her firstborn daughter, Corisande Armandine, in 1782. She had another daughter, Aglae Angelique, in 1787. The awaited son, Antoine, was born in 1789.
The French Revolution broke into pieces the glamorous way of life of the family. I have not info, but I know that Aglae of Polignac, the beautiful "Guichette", was dead in an accidental fire in 1803, when she was at Edimbourgh. She was just thirty-five years old.
Well...about her daughter Aglae of Gramont...I just can tell you that the great Aleksandr Puskhin knew her so well. The russian husband of Aglae, the elderly retired general Alexandr Davidoff, and his younger step-brother, Vassily Davidoff, were the owners of a great estate at Camenca. Our talented Puskhin wrotte that Alexandr Davidoff was "a second Falstaff". This mean, Alexandr Davidoff was: "voluptuous, coward, boastful, not stupid, funny, lachrymose and fat".
About Aglae of Gramont, Pushkin thought that the lady was really pretty, but frivolous and, above all the things, a coquette. Pushkin was enchanted by the daughter of Aleksandr and Aglae, Adele, aged twelve at these times.
I know that Aglae lose her russian husband in 1815. She remarried the famous corsican general Horace Sébastiani, count of La Porta. Horace was also a widow: his first wife, "Fanny" Franquetot de Coigny was dead when she gave birth to their first daughter, Françoise (also nicknamed Fanny) Alterice Rosalba.