Photograph of 19th century <a href="https://en.wikipedia.org/wiki/Mandarin_(bureaucrat)" class="extiw" title="w:Mandarin (bureaucrat)">mandarins</a>.
The picture is taken from a website (<a rel="nofollow" class="external free" href="http://nguyentl.free.fr/">http://nguyentl.free.fr/</a>) which is a huge gallery of tons of old photographs of Vietnam, some dating to the mid 19th century.  The photographs are compiled from a variety of sources besides just the author's own collection, and is intended obviously to share the pictures for any interested.  It is fair use because even if some of these pictures have a copyright, they would have long since expired.