<a href="https://en.wikipedia.org/wiki/Duke_Ferdinand_of_Brunswick-Wolfenb%C3%BCttel" class="extiw" title="w:Duke Ferdinand of Brunswick-Wolfenbüttel">Duke Ferdinand of Brunswick-Wolfenbüttel</a> (1721-1792)
<bdi><a href="https://en.wikipedia.org/wiki/en:Johann_Heinrich_Tischbein" class="extiw" title="w:en:Johann Heinrich Tischbein"><span title="painter from Germany (1722-1789)">Johann Heinrich Tischbein</span></a>
</bdi>
dated 1760
<a rel="nofollow" class="external text" href="https://www.rct.uk/collection/400600">Royal Collection RCIN 400600</a>