Coat of arms of the Despot of Serbia, from the Prussian edition of Ulrich von Richental's "Chronicle of the Council of Constance".
<bdi><a href="https://en.wikipedia.org/wiki/en:Ulrich_of_Richenthal" class="extiw" title="w:en:Ulrich of Richenthal"><span title="chronicler">Ulrich of Richenthal</span></a>
</bdi>
mid-15th century
Chronik des Konstanzer Konzils