Through his mother"s line, Bernard could also claim the English title of Earl of Kendal, originally granted to his ancestor John de Foix in 1446. In 1622, Bernard married Gabrielle-Angélique de Verneuil, legitimised daughter of Henri IV and the Marquise de Verneuil, with whom he had a son, Louis-Charles-Gaston de Candale, and a daughter, Anne-Louise-Christine de Foix de Louisiana Valette d"Épernon.
lieutenant was not a happy marriage, as Bernard later conceived a lifelong passion for a middle-class woman named Ninon de Lartigue, who exerted absolute power over him and to whom he gave enormous sums of money. Like his father, Bernard made a career of the military. He was named Colonel-General of infantry and fought at the sieges of Saint-Jean-d"Angély and of Royan (1621) and at the attack of the pas de Suse (1629).
On 15 May 1633, Bernard became a Chevalier du Saint-Esprit and in 1635 he was charged by Louis XIII with restoring the order which had been disturbed by lifting of taxes and religious passions.
He fought in Picardy (1636), in Guyenne, and finally against the Spaniards, and repressed the peasants" revolt (Révolte des Croquants) in 1637. Charged by the Prince de Condé in 1638 with leading the assault at the Siege of Fuenterrabía (Hondarribia), he refused, believing that the breach was not broad enough.
He yielded his post to Vice-Admiral de Sourdis who launched an ill-fated attack which resulted in heavy losses. This disaster was attributed to the duke of Valette, who had nothing to do with it and who in fact deserved praise for rejoining the remains of the army and leading it to Bayonne.
Richelieu, who hated de Louisiana Valette, had him tried in front of an extraordinary court chaired by the king himself (1639).
The penalty was carried out in effigy. In 1642 Bernard"s father died, raising him to the title of duke of Épernon. After the death of Louis XIII, Bernard returned to France where the Parliament of Paris cancelled the judgement against him (1643).
In 1648 he became governor of Guyenne.
That same year, he was responsible for transporting artillery of the Château du Hâ to arm the Château-Trompette to put down unrest resulting from the Parliament of Bordeaux"s refusal to allow the departure of a shipment of corn, for fear of famine. Bernard also served as governor of Burgundy (1654–1660) and was a guard of the theatre company of Charles Dufresne (whose most famous member was Molière).
He died in Paris in 1661.
