Anne de Caumont

Duke of Fronsac https://en.m.wikipedia.org/wiki/Duke_of_Fronsac

First creation

The title of duc de Fronsac was first created in 1608 for the House of Longueville, a bastard-cadet branch of the House of Valois. The mother of the first duke, Anne de Caumont (1574–1642), held the lesser title of marquis de Fronsac when her son Léonor II d'Orléans was created a duke. The title became extinct after the first duke died without an heir and the title passed to his father, who had no other issue.

In 1608, Léonor II d'Orléans (1605–1622) was created 1st Duke of Fronsac and held the title until his death in January 1622. Having no heir, the title was passed to his father. Beginning in 1622, the title was in the possession of the first duke's father, François III d'Orléans (1570–1631), 2nd Duke of Fronsac, Duke of Château-Thierry and Count of Saint-Pol. Having no other heirs after his only son preceded him in death, the title became extinct when François III died in 1631.