[3] In 1239, during the Barons' Crusade, de Vieille-Brioude accompanied Theobald I of Navarre who left France with 1,000 to 1,500 French knights for the Holy Land.

He had allied himself with his remaining forces, in the absence of the Hospitallers and a large number of Crusaders, with al-Salih Ismail, who was to be defeated in his reconquest of Damascus.

Richard, on the advice of de Vieille-Brioude, Hugh of Burgundy and Walter of Jaffa, ratified the treaty on 23 April 1241 and returned to England on May 3.

[7] Richard did not have great esteem for "the two twin brothers" as he called the Templars and the Hospitallers, who charged with defending the Holy Land, competing for their wealth instead of putting it at the service of the salvation of the kingdom.

⚜ At that time, Amaury VI de Montfort and other barons of France were freed from captivity in Cairo and Richard of Cornwall built the fortress of Ascalon.