<https://theonlineportraitgallery.com/portrait/charles-ii-gonzaga-duke-of-mantua-and-montferrat-2/#primaryimage>
<http://schema.org/caption>
"Charles II Gonzaga, Duke of Mantua and Montferrat"
<https://theonlineportraitgallery.com/portrait/charles-ii-gonzaga-duke-of-mantua-and-montferrat-2/>