Eighth Crusade (1270)
Louis IX of France decided to launch another Crusade after the fall of Jaffa and Antioch to the Mamluks in 1268. However, instead of going to the Holy Land he decided to land in Tunis because of the rumors that Caliph of Tunis, Muhammad I al-Mustansir will convert to Christianity if the Crusaders would provide him military assistance against the rebels.
The Crusaders landed in Tunis in July of 1270 but they were immediately surrounded by Tunisian forces. Louis died on August 25, 1270, probably from dysentery. His brother Charles of Anjou who arrived one day earlier immediately concluded a peace treaty and returned to France.