Coat of arms of the Most Serene Prince <a href="https://en.wikipedia.org/wiki/Dadiani" class="extiw" title="en:Dadiani">Dadian</a> of Mingrelia.
Unknown author<span style="display: none;">Unknown author</span>
<a rel="nofollow" class="external text" href="http://gerbovnik.ru/arms/2115.html">Russian Heraldry Book</a> (a publication now in public domain))