Portrait of <a href="https://en.wikipedia.org/wiki/en:John_George_I,_Duke_of_Saxe-Eisenach" class="extiw" title="w:en:John George I, Duke of Saxe-Eisenach"><span title="German duke (1634-1686)">John George I, Duke of Saxe-Eisenach</span></a> (1634-1686), son of <a href="https://en.wikipedia.org/wiki/en:William,_Duke_of_Saxe-Weimar" class="extiw" title="w:en:William, Duke of Saxe-Weimar"><span title="German Duke (1598-1662)">William, Duke of Saxe-Weimar</span></a>
<bdi><a href="//commons.wikimedia.org/wiki/Category:Unidentified_engravers" title="Category:Unidentified engravers">Unidentified engraver</a>
</bdi>
between 16th century and 19th century
<a rel="nofollow" class="external free" href="http://digi.ub.uni-heidelberg.de/fwhb/klebeband1">http://digi.ub.uni-heidelberg.de/fwhb/klebeband1</a>