Note 3 — CANTO XVI.
Charles Eliot Norton translation
The Conti Guidi had been compelled to sell to the Florentines their stronghold of Montemurlo, because they could not defend it from the Pistoians. The Cerchi and the Buondelmonti had been forced by the Florentine Commune to give up their fortresses and to take up their abode in the city, where they became powerful, and where the bitterness of intestine discord and party strife had been greatly enhanced by their quarrels.