The flower-de-luce is in the banner of France. Borel, Trésor de Recherches , cited by Roquefort, Glossaire , under the word Leye , says:⁠—

“The oriflamme is so called from gold and flame; that is to say, a lily of the marshes. The lilies are the arms of France in a field of azure, which denotes water, in memory that they (the French) came from a marshy country. It is the most ancient and principal banner of France, sown with these lilies, and was borne around our kings on great occasions.”