 | This article relies largely or entirely on a single source. (August 2023) |
Roger-Bernard IV de Foix (circa 1330 - 1381) was viscount of Castelbon. He was the son of Roger Bernard IV of Foix, viscount of Castelbon and Constance de Luna. He was the eighth degree ancestor of King Henry IV of France.[1]
- ^ Anne Berdoy & Jeanne-Marie Fritz, Mont-de-Marsan, Atlas historique des villes de France, XII c., les prémices de la ville, Ausonius éditions, septembre 2018