Латур д’Овернь
Her mother was from the House of La Tour d'Auvergne, her father being the last Count of Boulogne from the aforementioned House. Her maternal grandmother Jeanne de Bourbon-Vendôme was a direct patrilineal descendant of Louis, the first duke of Bourbon. This made Catherine a direct descendant of Louis IX of France, and of the House of Capet, albeit through a female line. Also this made her a 7th cousin, once removed of her husband Henry and a 6th cousin, 3 times removed of Henri of Navarre, her son-in-law.