The Pope arrived on the 18th June, 1273, with Charles of Anjou, King of Naples, and Baldwin of Flanders, who styled himself Emperor of Constantinople, “and, as the sojourn of Florence pleased them,” writes Villani, “because of the goodness of the water, the salubrity of the air and the comfort to be found in the city, they determined to spend the summer there. The Pope observing that so fine a city suffered by reason of the parties (for the Ghibellines were in exile), willed that they should return and make peace with the Guelphs, and it was done. On the 2nd July the said Pope, with his cardinals, King Charles, the Emperor Baldwin, all the barons and courtiers, and the Florentine people, collected in the dry bed of the Arno at the foot of the bridge of Rubaconte [now alle Grazie]; and the illustrious and great people took their places on huge scaffoldings of wood which had been erected. And there the Pope judged between the Guelphs and the Ghibellines, under pain of excommunication to whomsoever did not obey. He caused the leaders of each party to kiss each other on the mouth and make peace, and give bail and hostages; and all the castles held by the Ghibellines were to be given into the hands of King Charles.” The peace was but short-lived, as the Ghibellines, warned of the evil intentions of the King towards them, left the city four days later. Things in Florence went from bad to worse, so that Pope Nicholas III. was begged to send a legate to promote peace. Once more Palazzo Mozzi “became a second Rome,” for the Cardinal Fra Latino Frangipani was an honoured guest there in October 1278. His first task was to reconcile the Guelphs, who had fallen out among themselves, and then he made peace between them and the Ghibellines. The “Peace of Cardinal Latino” was signed, amid general rejoicing, in the Piazza Vecchia of Sta. Maria Novella in 1280. In 1314 King Robert of Naples sent his brother Piero, Count of Gravina, with three hundred horsemen, at the urgent request of the Florentines, to help them against Uguccione della Fagiuola, whom the Pisans had taken into their pay. The young Count dismounted at Palazzo Mozzi in August, and Ammirato describes him as “prudent and discreet. He showed no sign of the pride and haughtiness of royalty in his dealing with the citizens, behaving courteously to all.... To these qualities were added the natural advantages of remarkable beauty both of face and person.” The Florentines were delighted with him, and his death at the battle of Montecatini the following year was sincerely mourned. Seven years later the old palace opened its doors to a very different guest. Walter de Brienne, Duke of Athens and Count of Lecce, who was to become the hated tyrant of Florence, stayed there for some time when he first arrived as Vicario of the Duke of Calabria.