Starting from the fifteenth century, the Lombard-Venetian koiné began to give ground with respect to the Tuscan, a phenomenon that Tagliavini describes as follows: "Florentine, thanks to (Dante) and other great Tuscans like Petrarch and Boccaccio, to the central position of Florence and to the historical conditions of the time, gradually spread throughout Italy, also resulting in the disappearance of the High-Italian κοινή, which in the thirteenth century had risen to a certain prestige".