Pope Martin V., who was a Colonna, and therefore a Ghibelline--the only Ghibelline pope who ever reigned--was the one sovereign in Italy who still favoured Visconti, and he now intervened to make peace. A treaty was patched up by which the Duke lost a good deal of territory, and was bound to set at liberty the wife and daughters of Carmagnola. This was the peace of 1426, concluded on the thirtieth of December. Little more than a month later, on the fifth of February 1427, the Republic sent for Carmagnola again, for the Duke had simply refused to hand over the fortresses he was to yield by the treaty, and on the twenty-fourth of March Carmagnola and his wife made a sort of triumphal entry into the city.
[Sidenote: _Oct. 11, 1427. Victory of Carmagnola at Macalò, Franceso Bassano; ceiling, Hall of the Great Council._]
In the campaign which followed, though for the most part pursuing his policy of inactivity, in spite of the protests of the Senate and the Doge, Carmagnola condescended to win a battle for Venice at Macalò, which it must be admitted, for his reputation, was a brilliant victory; and he soon asked leave to go and take more baths, as if the whole affair were perfectly indifferent to him. To this the Senate objected, but he was given all manner of rich compensation for his services, and came to Venice on leave. He was received with an ovation.
[Sidenote: _Bergamo surrenders to Carmagnola, Aliense; Sala della Bussola._]
He had, indeed, been opposed to some of the greatest condottieri of the time, such as Francesco Sforza and Piccinino, and the Venetians seem to have valued him, because they were convinced that he could beat any opponent if he pleased, and only required gifts and flattery to rouse him to action. These were lavished on him, and a second peace with Visconti was concluded in April 1428, about fourteen months after the first. It was ratified and announced in May, and again Carmagnola entered Venice in triumph. He was now formally invested with the great feudal estate of Chiari.
As was to be expected, Visconti again failed to fulfil the conditions of the treaty, and within three years hostilities broke out again. To the amazement and mortification of the Venetian government, however, Carmagnola now resigned his commission, almost at the moment when he was to have taken command, and there is reason to believe that he was even then secretly negotiating with Visconti. But the Republic could not afford to lose such a man at such a moment; he was offered conditions which must have surpassed even his own tolerably large expectations. Not only was he to possess for himself and all his descendants the great estate of Chiari, with its rental, but another large feudal holding in the territory of Brescia was promised him on the same conditions; if all Lombardy were taken, he was promised the complete restitution of all the domains which Visconti had formerly bestowed upon him; all plunder and all prisoners of war were to be his, the Republic contracting to pay him a certain sum for each prisoner of importance whom he handed over to the government; as if this were not enough, he was to be crowned Duke of Milan if he could drive out Visconti.