Crown of the French Princes du Sang (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>).
<a href="//commons.wikimedia.org/wiki/User:David_Liuzzo" title="User:David Liuzzo">David Liuzzo</a>
Attribution
<span class="int-own-work" lang="en">Own work</span>