The frieze of the Sala del Maggior Consiglio is decorated with portraits of the Doges. The wall to the right of the Capture of Constantinople features a couple of these portraits. If you count from left to right, you will notice that the first panel is remarkably different. Instead of the face of the Doge, a black veil is painted. This is where Doge Marino Faliero should be depicted (no. 20 in the official audioguide).