Crown of the French <i>Princes du Sang</i> (nobles in the descendance of <a href="https://en.wikipedia.org/wiki/Louis_IX_of_France" class="extiw" title="en:Louis IX of France">Louis IX</a>).
Tomasz Steifer, Gdansk
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>