Military operations now slackened more and more, for mischief was brewing in the city, and all men foresaw that worse troubles were at hand. Therefore, although urged to resume hostilities by their valiant and energetic leader, the Judge of Gallura, the Florentines so sorely needed tranquillity that they finally concluded a treaty of peace at Fucecchio on June 12, 1293. According to its stipulations, all prisoners of war were to be released; no duties were to be levied on inhabitants of the communes of the League in passing through Pisa, nor on Pisans passing through the said communes. The office of Podestà or Captain of Pisa was only to be held by a member of the League, and it was expressly forbidden to confer that post on any rebel or adversary of the said League, or any scion of the Montefeltro house. Further, Count Guido, the brave chief who had shown so much energy and daring in defence of the Pisan Republic, was to be dismissed, together with all the foreign Ghibellines; and twenty-five citizens of the best Pisan blood were to be given in hostage to secure the due observance of the terms. Such was the reward of the veteran leader's fidelity and heroism! On being paid off, he entered the council chamber, and after reproving the ingratitude of the Pisans in dignified words, took his leave without expressing any wish for revenge. Yet, being still in command of an experienced army devoted to himself, vengeance lay in his power, had he chosen to follow the fashion of the times. Another clause of the treaty provided that the descendants of Count Ugolino and the Judge of Gallura should be freed from outlawry and reinstated in all their possessions.[329] X. From this moment the Florentines devoted their chief attention to the affairs of the city, although these had not been altogether neglected, even during the last wars. Continual improvements had been made in the administration of the Republic, and in many respects it was a model administration, while there was also a notable increase of commerce, trade, and wealth. At the same time many public works had been completed under the direction of the famous architect Arnolfo di Cambio, the creator of some of the grandest public buildings in Florence. He planned the alterations for the enlargement of the city, first undertaken in 1285, and afterwards built the third circuit of walls, the which work was also superintended by the celebrated chronicler Giovanni Villani. It was likewise by Arnolfo's care that the Loggia of Or' San Michele, then used as a corn market, was built in and paved, the Piazza dei Signori supplied with a pavement, and the Badia embellished and restored. Folco Portinari, the father of Dante's Beatrice, founded, at his own expense, the church and hospital of Santa Maria Nuova. The Piazza of Santa Maria Novella was laid out, and many other public works of a similar kind were begun.[330]