What is a french monarch's lily?

The fleur-de-lis (also spelled fleur-de-lys; plural fleurs-de-lis or -lys; an archaic spelling is fleur-de-luce) is used in heraldry, where it is particularly associated with the French monarchy (see King of France). Fleur-de-luce also means Flower of Light. Lucy/Luce means light. The name, anglicized, means "lily flower", and the symbol is in fact a stylized Iris pseudacorus L.