The Seventh Crusades Begins

The Seventh Crusade was a crusade led by Louis IX of France from 1248 to 1254. Approximately 50,000 gold bezants (a sum equal to the entire annual revenue of France) was paid in ransom for King Louis who, along with thousands of his troops, were captured and defeated by the Egyptian army led by the Ayyubid Sultan Turanshah supported by the Bahariyya Mamluks led by Faris ad-Din Aktai, Baibars al-Bunduqdari, Qutuz , Aybak and Qalawun.

http://en.wikipedia.org/wiki/Seventh_Crusade