Vittoria and Brachiano, now married, hold court in Padua. Three mysterious strangers have arrived to enter Brachiano's service. These are Francisco, disguised as Mulinassar, a Moor, and Lodovico and Gasparo, disguised as Capuchin monks, all conspiring to avenge Isabella's death. They begin their revenge by poisoning Brachiano. As he is dying, Lodovico and Gasparo reveal themselves to him. Next, Zanche, Vittoria's Moorish maid, who has fallen in love with her supposed countryman Mulinassar, reveals to him the murders of Isabella and Camillo and Flamineo's part in them.