The disturbances at Bologna were quelled; but the bonds of law and order throughout the Papal States were now loosened, and it became evident that a more determined minister must be placed at the helm, or the experiment of the existing form of government must be abandoned in despair. A republic or a return to the old principles of despotism would then be inevitable. In this emergency the eyes of the Pope and of all prudent persons at Rome were turned to Rossi, who, since the fall of Louis Philippe's Government, from which he had been ambassador to the Roman States, had resided there as a private citizen, taking no active share in politics, but often consulted by both parties, owing to his high reputation for sagacity and firmness. Exiled on account of his liberal opinions by Gregory, he had laid the foundation of his fame at Paris, where he successively became professor, peer, and ambassador, and was highly esteemed by all parties as a writer and a statesman. Once before, Pius had solicited him to form a ministry; but he had declined, because conscious that the affections of the populace were not with him, and he judged that the minds even of the better portion of the citizens were not yet prepared for a resolute attempt to carry on a constitutional government by firm measures.
He suggested to the Pope that he was probably odious to the court on account of his previous employments and his writings; that some would perhaps look very coldly on a minister who had married a Protestant wife; and that the French Republic might be displeased if he should hold a high post at Rome. But in the middle of September the solicitations of the Pope and of many respectable persons in the State became so urgent that Rossi consented to serve; the opinion was universal that no other person possessed the requisite abilities, character, and experience to carry on the Government at this perilous crisis; and that, if he failed, all indeed was lost. He selected for his colleagues men of liberal politics, but temperate in their opinions. He announced his intention to carry into effect the Fundamental Statute, in all its parts, according to constitutional usage; to counteract and repress both parties opposed to that instrument; to abolish exemptions, restore the finances, and reorganize the army; to conclude a league with Piedmont and Tuscany, even if it should be impossible with Naples; and to fix the contingent of troops which the Pope was to supply, so that he need not in any way mingle in the war.