John Tristan of France

John Tristan (8 April 1250 – 3 August 1270) was a Capetian prince, the fourth son of King Louis IX of France. He was born at Damietta during the Seventh Crusade, and his mother named him Tristan amid the crisis of Louis's capture by the Egyptians.

He married Yolande of Burgundy, countess of Nevers, in 1266, ruling Nevers in her right, and in 1268 received Valois as his appanage. He died of dysentery at Tunis on the Eighth Crusade, childless; Valois reverted to the crown.