This portrait, derived from <a href="//commons.wikimedia.org/wiki/File:Charles_Von_H%C3%BCgel_(1903).pdf" title="File:Charles Von Hügel (1903).pdf"><i>Charles Von Hügel, April 25, 1795 - June 2, 1870 (1903)</i></a>, depicts Hügel, the father of the author Anatole von Hügel. The caption is "Charles Von Hügel. From a photograph by Ghemar Frères. <i>Brussels, 1863.</i>". A note in the work states, "At the age of sixty-eight. From a photograph by Ghemar Frères of Brussels of the diplomatists assembled for the Conference on the ‘Rachat du péage de l'Escaut.' Brussels, July, 1863".
<bdi><a href="https://www.wikidata.org/wiki/Q21557453" class="extiw" title="d:Q21557453"><span title="Belgian photostudio">Ghémar Frères studio</span></a>
</bdi>
1863
A copy of the book held at New York Public Library, digitised by google and made available at the Internet Archive (archive.org) at this <a rel="nofollow" class="external text" href="https://archive.org/details/charlesvonhgela00hggoog">location</a>.