During his second crusade, Louis died at Tunis, August 25, 1270, and was succeeded by his son, Philip III. Louis was traditionally believed to have died from bubonic plague but the cause is thought by modern scholars to have been dysentery. The Bubonic Plague did not strike Europe until 1348, so the likelihood of him contracting and ultimately dying from the Bubonic Plague was very slim.
Christian tradition states that some of his entrails were buried directly on the spot in Tunisia, where a Tomb of Saint-Louis can still be visited today, whereas other parts of his entrails were sealed in an urn and placed in the Basilica of Monreale, Palermo, where they still remain. His corpse was taken, after a short stay at the Basilica of Saint Dominic in Bologna, to the French royal necropolis at Saint-Denis, resting in Lyon on the way. His tomb at Saint-Denis was a magnificent gilt brass monument designed in the late 14th century. It was melted down during the French Wars of Religion, at which time the body of the king disappeared. Only one finger was rescued and is kept at Saint-Denis.