Roger IV (died 24 February 1265), son and successor of Roger-Bernard II the Great, was the seventh count of Foix from 1241 to his death. His reign began with the south again at war with the north in France and, though he was reluctant to join his father's old ally, Raymond VII of Toulouse, in revolt and he did not aid the king of England, Henry III, in his Saintonge War. Roger IV was a vassal of both the count of Toulouse (for his county of Foix) and the king of France (for his Carcassonne lands), then Louis IX. His loyalty to the king, however, took precedence and war broke out with Raymond VII (October 1242). Though Raymond was forced to submit to the king on November 30, the war with Roger continued until January 1243, when the king ended it.