Roger IV of Foix

Roger IV (died 24 February 1265) succeeded his mother Ermessinde as Viscount of Castelbon in 1237, and his father Roger Bernard II as Count of Foix in 1241. After the failed 1242 revolt of Pyrenean lords against Alphonse of Poitiers, he submitted, but the Count of Toulouse seized Saverdun from him.

Roger sought royal aid in 1243, became a direct crown vassal and recovered Saverdun. In 1245 he issued measures abolishing serfdom in Foix. Unlike his father he was a loyal Catholic who favoured the Inquisition, which nevertheless suspected him.

He founded Mazères in 1251 and several other bastides. His dispute over Andorra with the bishop of Urgell was settled by his son in 1278.