Who married John I, Count of Foix?

John I, Count of Foix also known as Jean de Foix-Grailly (1382 – 4 May 1436) was Count of Foix from 1428 until his death in 1436. He succeeded his mother Isabella, Countess of Foix. His father was Archambaud de Grailly.

Jeanne d'Albret (1403-1433), comtesse de Foix, est la fille de Charles I^er d'Albret et de Marie de Sully, dame de Craon.

Joan of Navarre (French: Jeanne, Spanish: Juana; 1382 – July 1413) was the heiress presumptive to the throne of Navarre in 1402–1413, and regent of Navarre in the absence of her father in 1409–1411.