The Emperor, who regarded Milan only as a fine large prison, got out of it as soon as he could. Petrarch accompanied him as far as five miles beyond Pìacenza, but refused to comply with the Emperor's solicitations to continue with him as far as Rome.

The Emperor departed from Sienna the 28th of March, with the Empress and all his suite. On the 2nd of April he arrived at Rome. During the next two days he visited the churches in pilgrim's attire. On Sunday, which was Easter day, he was crowned, along with his Empress; and, on this occasion, he confirmed all the privileges of the Roman Church, and all the promises that he had made to the Popes Clement VI. and Innocent VI. One of those promises was, that he should not enter Rome except upon the day of his coronation, and that he should not sleep in the city. He kept his word most scrupulously. After leaving the church of St. Peter, he went with a grand retinue to St. John's di Latrana, where he dined, and, in the evening, under pretext of a hunting-party, he went and slept at St. Lorenzo, beyond the walls.

The Emperor arrived at Sienna on the 29th of April. He had there many conferences with the Cardinal Albornoz, to whom he promised troops for the purpose of reducing the tyrants with whom the Legate was at war. His Majesty then went to Pisa, where, on the 21st of May, 1355, a sedition broke out against him, which nearly cost him his life. He left Tuscany without delay, with his Empress and his whole suite, to return to Germany, where he arrived early in June. Many were the affronts he met with on his route, and he recrossed the Alps, as Villani says, "with his dignity humbled, though with his purse well filled."

Lælius, who had accompanied the Emperor as far as Cremona, quitted him at that place, and went to Milan, where he delivered to Petrarch the Prince's valedictory compliments. Petrarch's indignation, at his dastardly flight vented itself in a letter to his Imperial Majesty himself, so full of unmeasured rebuke, that it is believed it was never sent.

Shortly after the departure of the Emperor, Petrarch had the satisfaction of hearing, in his own church of St. Ambrosio, the publication of a peace between the Venetians and Genoese. It was concluded at Milan by the mediation of the Visconti, entirely to the advantage of the Genoese, to whom their victory gained in the gulf of Sapienza had given an irresistible superiority. It cost the Venetians two hundred thousand florins. Whilst the treaty of peace was proceeding, Venice witnessed the sad and strange spectacle of Marino Faliero, her venerable Doge, four-score years old, being dragged to a public execution. Some obscurity still hangs over the true history of this affair. Petrarch himself seems to have understood it but imperfectly, though, from his personal acquaintance with Faliero, and his humane indignation at seeing an old man whom he believed to be innocent, hurled from his seat of power, stripped of his ducal robes, and beheaded like the meanest felon, he inveighs against his execution as a public murder, in his letter on the subject to Guido Settimo.

Petrarch, since his establishment at Milan, had thought it his duty to bring thither his son John, that he might watch over his education. John was at this time eighteen years of age, and was studying at Verona.

The September of 1355 was a critical month for our poet. It was then that the tertian ague commonly attacked him, and this year it obliged him to pass a whole month in bed. He was just beginning to be convalescent, when, on the 9th of September, 1355, a friar, from the kingdom of Naples, entered his chamber, and gave him a letter from Barbato di Salmone. This was a great joy to him, and tended to promote the recovery of his health. Their correspondence had been for a long time interrupted by the wars, and the unsafe state of the public roads. This letter was full of enthusiasm and affection, and was addressed to Francis Petrarch, the king of poets. The friar had told Barbato that this title was given to Petrarch over all Italy. Our poet in his answer affected to refuse it with displeasure as far beyond his deserts. "There are only two king-poets," he says, "the one in Greece, the other in Italy. The old bard of Mæonia occupies the former kingdom, the shepherd of Mantua is in possession of the latter. As for me, I can only reign in my transalpine solitude and on the banks of the Sorgue."

Petrarch continued rather languid during autumn, but his health was re-established before the winter.

Early in the year 1356, whilst war was raging between Milan and the Lombard and Ligurian league, a report was spread that the King of Hungary had formed a league with the Emperor and the Duke of Austria, to invade Italy. The Italians in alarm sent ambassadors to the King of Hungary, who declared that he had no hostile intentions, except against the Venetians, as they had robbed him of part of Sclavonia. This declaration calmed the other princes, but not the Viscontis, who knew that the Emperor would never forget the manner in which they had treated him. They thought that it would be politic to send an ambassador to Charles, in order to justify themselves before him, or rather to penetrate into his designs, and no person seemed to be more fit for this commission than Petrarch. Our poet had no great desire to journey into the north, but a charge so agreeable and flattering made him overlook the fatigue of travelling. He wrote thus to Simonides on the day before his departure:—"They are sending me to the north, at the time when I am sighing for solitude and repose. But man was made for toil: the charge imposed on me does not displease me, and I shall be recompensed for my fatigue if I succeed in the object of my mission. The Lord of Liguria sends me to treat with the Emperor. After having conferred with him on public affairs, I reckon on being able to treat with him respecting my own, and be my own ambassador. I have reproached this prince by letter with his shameful flight from our country. I shall make him the same reproaches, face to face, and vivâ voce. In thus using my own liberty and his patience, I shall avenge at once Italy, the empire, and my own person. At my return I shall bury myself in a solitude so profound that toil and envy will not be able to find me out. Yet what folly! Can I flatter myself to find any place where envy cannot penetrate?"