Giovanni Villani, Villani's Chronicle
“ For hitherto they had been living in many delights and dainties, and in tranquillity and with continual banquets; and every year throughout almost all the city on the first day of May, there were bands and companies of men and of women, with sports and dances. But now it came to pass that through envy there arose factions among the citizens; and one of the chief and greatest began in the sesto of offence, to wit of Porte San Piero, between the house of the Cerchi, and the Donati; on the one side through envy, and on the other through rude ungraciousness. ”
