Unknown painter, detail of Crucifixion , 13th or early 14th century 
In the very ruined fresco we can see the faces of Christ and the Madonna
<a href="//commons.wikimedia.org/wiki/User:Laurom" title="User:Laurom">Laurom</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>