There is a party at the Ducal Palace in Mantua. The Duke confides to a courtier that he intends to seduce a girl whom he has seen in church and even followed her home afterwards. He is a young profligate, capable of anything, even to changing his identity in order to attain his aims. In the meantime, he is courting the Countess of Ceprano, thereby infuriating her husband who, in front of all the people present, is mocked by Rigoletto, the hunchback, court jester. The courtiers, convinced that Rigoletto has a lover, decide to take revenge and agree to meet to work out a plan. The dancing starts but the festive atmosphere is brusquely interrupted by the arrival of the old Count Monterone who accuses the Duke of having betrayed his daughter. Rigloetto mocks the old man. In his rage Monterone hurls an awful curse first, at the Duke and has him arrested and then, on Rigoletto who becomes afraid.
In the dead of night, Rigoletto returns home. He is thinking about Monterone’s curse when he bumps into Sparafucile, an assassin, who wants a job to do. Rigloletto says he will send for him if he needs him. On his own once more, Rigoletto meditates on his condition as a cripple but also as a cruel servant of power, forced to make the Duke laugh but surrounded by courtiers who hate him. He is aware of his physical and moral deformation. Yet, even he, is capable of loving. The only affection he feels is for his daughter who, since his wife’s death, he has kept hidden from the world.