Still they were not so absolutely cast down as to prevent them from raising great sums of money, hiring troops, and sending to their friends for assistance; but all they could do was insufficient to restrain such a powerful enemy; so that they were obliged to offer the sovereignty to Charles duke of Calabria, son of King Robert, if they could induce him to come to their defense; for these princes, being accustomed to rule Florence, preferred her obedience to her friendship. But Charles, being engaged in the wars of Sicily, and therefore unable to undertake the sovereignty of the city, sent in his stead Walter, by birth a Frenchman, and duke of Athens. He, as viceroy, took possession of the city, and appointed the magistracies according to his own pleasure; but his mode of proceeding was quite correct, and so completely contrary to his real nature, that everyone respected him. The affairs of Sicily being composed, Charles came to Florence with a thousand horse. He made his entry into the city in July, 1326, and his coming prevented further pillage of the Florentine territory by Castruccio. However, the influence which they acquired without the city was lost within her walls, and the evils which they did not suffer from their enemies were brought upon them by their friends; for the Signory could not do anything without the consent of the duke of Calabria, who, in the course of one year, drew from the people 400,000 florins, although by the agreement entered into with him, the sum was not to exceed 200,000; so great were the burdens with which either himself or his father constantly oppressed them. To these troubles were added new jealousies and new enemies; for the Ghibellines of Lombardy became so alarmed upon the arrival of Charles in Tuscany, that Galeazzo Visconti and the other Lombard tyrants, by money and promises, induced Louis of Bavaria, who had lately been elected emperor contrary to the wish of the pope, to come into Italy. After passing through Lombardy he entered Tuscany, and with the assistance of Castruccio, made himself master of Pisa, from whence, having been pacified with sums of money, he directed his course towards Rome. This caused the duke of Calabria to be apprehensive for the safety of Naples; he therefore left Florence, and appointed as his viceroy Filippo da Saggineto.