The Florentine banking family of the Cerchi, minor nobles of the Valdarno, with a seat especially at Acone near Pontassieve, settled in Florence in the early thirteenth century and increased their fortunes. The family became the heads of a consortium of the prominent Guelfs that securely controlled Florence after the battle of Benevento in 1266. In Florence, the Cerchi purchased some of the ancient structures in the closely packed inner city formerly belonging to the counts Guidi, cheek-by-jowl with the proud Florentine family of the Donati, with whom their growing mutual antagonism was expressed in violent episodes that polarized Florence within a couple of decades in a virtual civil war that aligned behind two captains, Corso Donati of the Neri Guelf faction— the "Black" Guelfs of the old noble oligarchy— and Vieri de' Cerchi of the Bianchi, the moderate party that represented itself as champions of working people. The resulting violence lasted, with irruptions of tranquility, into the fourteenth century.
