Princess Carolyne Sayn-Wittgenstein with her daughter Princess Mary, about 1840
<bdi><a href="https://en.wikipedia.org/wiki/en:Louis_Held" class="extiw" title="w:en:Louis Held"><span title="German photographer">Louis Held</span></a>
</bdi>
Rupert Hughes: <i><a rel="nofollow" class="external text" href="http://www.gutenberg.org/files/11419/11419-h/11419-h.htm#chap1">The Love Affairs of the Great Musicians, Vol 2</a></i>. L.C. Page &amp; Co., Boston 1903