Read it through once

We intended to go to the Bridge of Sighs, but happened into the Ducal Palace first--a building which necessarily figures largely in Venetian poetry and tradition. In the Senate Chamber of the ancient Republic we wearied our eyes with staring at acres of historical paintings by Tintoretto and Paul Veronese, but nothing struck us forcibly except the one thing that strikes all strangers forcibly--a black square in the midst of a gallery of portraits. In one long row, around the great hall, were painted the portraits of the Doges of Venice (venerable fellows, with flowing white beards, for of the three hundred Senators eligible to the office, the oldest was usually chosen Doge,) and each had its complimentary inscription attached--till you came to the place that should have had Marino Faliero's picture in it, and that was blank and black--blank, except that it bore a terse inscription, saying that the conspirator had died for his crime. It seemed cruel to keep that pitiless inscription still staring from the walls after the unhappy wretch had been in his grave five hundred years.