@cstross “The Great Council Chamber in the Doge's palace is one of the most visited sites in Venice… if we observe the portraits of the doges lined up underneath the ceiling all around the perimeter of the room, we will notice that one of the faces is covered by a black cloth. Underneath it is the portrait of Doge Marino Falier, disguised in such a manner because he soiled his hands with a foul deed: he attempted to establish a dictatorship under his power.”

https://www.venetoinside.com/en/news-and-curiosities/the-black-cloth-in-the-great-council-chamber