In 1473 he began directing the work to be done in the ducal chapel in the Castello Sforzesco. Only a few of the frescoes in the ducal chapel still survive today. It is difficult to determine the precise role Bembo played in the decoration of the chapel because he worked alongside several other artists, which would become a theme in his later life. In 1474 he worked on a chapel in the church of Santa Maria da Caravaggio alongside Giacomino Vincemala. He also worked closely with other associates on the polyptych in Pavia where he worked with Vincenzo Foppa and Zanetto Bugatto. In 1476 he painted frescoes of "The Procession of the Magi" and the "Annunciation" in the Collegio Castiglione Chapel, Pavia. His work for the Sforza court officially came to an end following the assassination of Galeazzo Sforza in 1477. He is also well known for his painting "Jesus among the Doctors" which hangs in the Pitti Palace in Florence.