第8回十字軍
In July 1270, Theobald embarked with his father-in-law on the Eighth Crusade to Tunis. Louis died of dysentery at the siege. Theobald died childless at Trapani in Sicily while returning that same year. He was succeeded by his younger brother, Henry I. His widow Isabella returned home to France, where she died a few months later and was buried at Provins.