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Like the King and Prince John Tristan of France, Count of Valois, he died in front of Tunis in August 1270, due to dysentery.
Her first marriage was to John Tristan, Count of Valois, son of Louis IX of France and Margaret of Provence, in June 1265; they had no children, and he died of dysentery in 1270 at Tunis while on the Eighth Crusade.