The Fleur de Lys is the second Symbol of the Bretonnian Faith and the Godess of Bretonnian Chivalery - the Lady of the Lake - behind the holy Grail. It is Part of a lot of typical Bretonnian Chests, Banners and generally Heraldy and specially Bretonnian Questing Kinghts bear it as a sign of their Quest for the Grail.