Louis and his two brothers left Constantinople in the retinue of Baldwin II who went on a tour in Europe to seek military assistance against the enemies of the Latin Empire in 1236. The French chronicler Guillaume de Nangis noted that the three brothers were still "very young". The chronicler also recorded that King Louis IX of France, who was the three brothers' cousin, received them "honorably and graciously". They grew up in the French royal court in Paris. They participated in the King's crusade against Egypt.