King Louis VII of France dreamt one night of the iris.It has such a lasting impression on him that he used it as his emblem during the Crusades.

• 法国国王路易七世有一夜梦见蝴蝶花，此花给他留下了不可磨灭的印象，于是在十字军圣战中他将蝴蝶花当作自己的徽章。