The two sons of Lord Folco, Pagano and Arvino, are reconciled, having previously feuded over which man would win the hand of Viclinda. Pagano, who once threatened the life of his brother, has returned from exile. A throng gathers in front of the church of Sant'Ambrogio to celebrate. Viclinda, now Arvino's wife, and their daughter Giselda are on hand to witness the reconciliation. A crusade to the Holy Land is announced and Arvino is to lead it. Pagano secretly vents his enduring frustration to Pirro, Arvino's squire: he still desires Viclinda ("Sciagurata! hai tu creduto" / "Wretched woman! Did you believe that I could forget you..."). As nuns sing in the background, Pirro and a gang of cut-throats agree to help Pagano take Viclinda for himself.