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http://en.wikipedia.org/wiki/Fleur-de-li...
Read a great story about how these guys ended up on the knight's standards and coats of arms...
Apparently one day, one army found themselves confronted by a much larger group... they turned tail and ran...
But found their retreat blocked by a huge English bog...
One brilliant boy noticed the iris growing through a part of the bog and figured that where it was shallow enough for iris, it was shallow enough for a fully armoured knight to walk through without sinking out of sight...
They crossed the bog and lived to fight another day... And remembered that the iris had saved their lives....