The _Giovanni da Procida_ was a further advance in political literature. In this tragedy, abandoning the indirectly liberal teachings of the Foscarini, Niccolini set himself to the purpose of awakening a Tuscan hatred of foreign rule. The subject is the expulsion of the French from Sicily; and when the French ambassador complained to the Austrian that such a play should be tolerated by the Tuscan government, the Austrian answered, “The address is to the French, but the letter is for the Germans.” The Giovanni da Procida was a further development of Niccolini's political purposes in literature, and at the time of its first representation it raised the Florentines to a frenzy of theater-going patriotism. The tragedy ends with the terrible Sicilian Vespers, but its main affair is with preceding events, largely imagined by the poet, and the persons are in great part fictitious; yet they all bear a certain relation to fact, and the historical persons are more or less historically painted. Giovanni da Procida, a great Sicilian nobleman, believed dead by the French, comes home to Palermo, after long exile, to stir up the Sicilians to rebellion, and finds that his daughter is married to the son of one of the French rulers, though neither this daughter Imelda nor her husband Tancredi knew the origin of the latter at the time of their marriage. Precida, in his all-absorbing hate of the oppressors, cannot forgive them; yet he seizes Tancredi, and imprisons him in his castle, in order to save his life from the impending massacre of the French; and in a scene with Imelda, he tells her that, while she was a babe, the father of Tancredi had abducted her mother and carried her to France. Years after, she returned heart-broken to die in her husband's arms, a secret which she tries to reveal perishing with her. While Imelda remains horror-struck by this history, Procida receives an intercepted letter from Eriberto, Tancredi's father, in which he tells the young man that he and Imelda are children of the same mother. Procida in pity of his daughter, the victim of this awful fatality, prepares to send her away to a convent in Pisa; but a French law forbids any ship to sail at that time, and Imelda is brought back and confronted in a public place with Tancredi, who has been rescued by the French.