The primitive coats of arms, used by the lords of Châteaubriant, was originally "Gules, semy of pine cones or", or "Gules, Papelonny or", which means red with numerous yellow pine cones, or red with yellow fish scales. During the battle of Al Mansurah, an episode of the Seventh Crusade, the lord of Châteaubriant saved Louis IX of France. The King permitted him to replace the pine cones with fleurs de lys, the royal French symbol. The coat of arms was henceforth "Gules, semy of fleurs de lys".