If anyone should ask why this book is written in Romance according to the usage of the French, even though we are Italian, I would say that there are two reasons: one, that we are in France; the other, that French is more pleasant and has more in common with all other languages.
Se aucuns demandoit porquoi ceste livre est escrit en romans selonc le patois de France, puis que nos somes Ytaliens, je diroie ce est por deus raisons: l’une que nos somes en France; l’autre por ce que la parleure est plus delitables & plus comunes a tous lingages.
Original text (French)