While these matters were being considered by the conspirators, Antonio Adimari, in expectation of getting assistance from them, disclosed the affair to some Siennese, his friends, naming certain of the conspirators, and assuring them that the whole city was ready to rise at once. One of them communicated the matter to Francesco Brunelleschi, not with a design to injure the plot, but in the hope that he would join them. Francesco, either from personal fear, or private hatred of some one, revealed the whole to the duke; whereupon, Pagolo del Mazecha and Simon da Monterappoli were taken, who acquainted him with the number and quality of the conspirators. This terrified him, and he was advised to request their presence rather than to take them prisoners, for if they fled, he might without disgrace, secure himself by banishment of the rest. He therefore sent for Antonio Adimari, who, confiding in his companions, appeared immediately, and was detained. Francesco Brunelleschi and Uguccione Buondelmonti advised the duke to take as many of the conspirators prisoners as he could, and put them to death; but he, thinking his strength unequal to his foes, did not adopt this course, but took another, which, had it succeeded, would have freed him from his enemies and increased his power. It was the custom of the duke to call the citizens together upon some occasions and advise with them. He therefore having first sent to collect forces from without, made a list of three hundred citizens, and gave it to his messengers, with orders to assemble them under the pretense of public business; and having drawn them together, it was his intention either to put them to death or imprison them.
The capture of Antonio Adimari and the sending for forces, which could not be kept secret, alarmed the citizens, and more particularly those who were in the plot, so that the boldest of them refused to attend, and as each had read the list, they sought each other, and resolved to rise at once and die like men, with arms in their hands, rather than be led like calves to the slaughter. In a very short time the chief conspirators became known to each other, and resolved that the next day, which was the 26th July, 1343, they would raise a disturbance in the Old Market place, then arm themselves and call the people to freedom.
The next morning being come, at nine o'clock, according to agreement, they took arms, and at the call of liberty assembled, each party in its own district, under the ensigns and with the arms of the people, which had been secretly provided by the conspirators. All the heads of families, as well of the nobility as of the people, met together, and swore to stand in each other's defense, and effect the death of the duke; except some of the Buondelmonti and of the Cavalcanti, with those four families of the people which had taken so conspicuous a part in making him sovereign, and the butchers, with others, the lowest of the plebeians, who met armed in the piazza in his favor.
The duke immediately fortified the place, and ordered those of his people who were lodged in different parts of the city to mount upon horseback and join those in the court; but, pn their way thither, many were attacked and slain. However, about three hundred horse assembled, and the duke was in doubt whether he should come forth and meet the enemy, or defend himself within. On the other hand, the Medici, Cavicciulli, Rucellai, and other families who had been most injured by him, fearful that if he came forth, many of those who had taken arms against him would discover themselves his partisans, in order to deprive him of the occasion of attacking them and increasing the number of his friends, took the lead and assailed the palace. Upon this, those families of the people who had declared for the duke, seeing themselves boldly attacked, changed their minds, and all took part with the citizens, except Uguccione Buondelmonti, who retired into the palace, and Giannozzo Cavalcanti, who having withdrawn with some of his followers to the new market, mounted upon a bench, and begged that those who were going in arms to the piazza, would take the part of the duke. In order to terrify them, he exaggerated the number of his people and threatened all with death who should obstinately persevere in their undertaking against their sovereign. But not finding any one either to follow him, or to chastise his insolence, and seeing his labor fruitless, he withdrew to his own house.
