It was in the month of May, during which, and upon holidays, it is the custom of Florence to hold festivals and public rejoicings throughout the city. Some youths of the Donati family, with their friends, upon horseback, were standing near the church of the Holy Trinity to look at a party of ladies who were dancing; thither also came some of the Cerchi, like the Donati, accompanied with many of the nobility, and, not knowing that the Donati were before them, pushed their horses and jostled them; thereupon the Donati, thinking themselves insulted, drew their swords, nor were the Cerchi at all backward to do the same, and not till after the interchange of many wounds, they separated. This disturbance was the beginning of great evils; for the whole city became divided, the people as well as the nobility, and the parties took the names of the Bianchi and the Neri. The Cerchi were at the head of the Bianca faction, to which adhered the Adimari, the Abati, a part of the Tosinghi, of the Bardi, of the Rossi, of the Frescobaldi, of the Nerli, and of the Manelli; all the Mozzi, the Scali, Gherardini, Cavalcanti, Malespini, Bostichi, Giandonati, Vecchietti, and Arrigucci. To these were joined many families of the people, and all the Ghibellines then in Florence, so that their great numbers gave them almost the entire government of the city. The Donati, at the head of whom was Corso, joined the Nera party, to which also adhered those members of the above-named families who did not take part with the Bianchi; and besides these, the whole of the Pazzi, the Bisdomini, Manieri, Bagnesi, Tornaquinci, Spini, Buondelmonti, Gianfigliazzi, and the Brunelleschi. Nor did the evil confine itself to the city alone, for the whole country was divided upon it, so that the captains of the Six Parts, and whoever were attached to the Guelfic party or the well-being of the republic, were very much afraid that this new division would occasion the destruction of the city, and give new life to the Ghibelline faction. They therefore sent again to Pope Boniface, desiring that, unless he wished that city which had always been the shield of the church should either be ruined or become Ghibelline, he would consider of some means for her relief. The pontiff thereupon sent to Florence, as his legate, Cardinal Matteo d’Acquasparta, a Portuguese, who, finding the Bianchi, as the most powerful, the least in fear, not quite submissive to him, he interdicted the city, and left it in anger; so that greater confusion now prevailed than previously to his coming.