Portrait of <a href="https://en.wikipedia.org/wiki/Grand_Duke_Constantine_Pavlovich_of_Russia" class="extiw" title="w:Grand Duke Constantine Pavlovich of Russia">Grand Duke Constantine Pavlovich of Russia</a> from the <a href="//commons.wikimedia.org/wiki/Hermitage_Museum" class="mw-redirect" title="Hermitage Museum">Hermitage Museum</a> (1809)
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Peter Ernst Rockstuhl</div>
<a rel="nofollow" class="external free" href="http://www.hermitagemuseum.org/wps/portal/hermitage/digital-collection/02.+Drawings/301244/?lng=ru">http://www.hermitagemuseum.org/wps/portal/hermitage/digital-collection/02.+Drawings/301244/?lng=ru</a>