None of Verdi's other operas was subjected to as radical a series of revisions as Simon Boccanegra. The initial version of 1857 was not a success, so that in 1880/81 Verdi not only rewrote large sections of the score but together with his new librettist Arrigo Boito also reworked the libretto. The result was a sombre work full of overwhelming sound pictures. This second version proved a great and lasting success.