This paper investigates the language of the vernacular version of Lanfranco’s Chirurgia parva in the manuscript Ital. Quart. 67 kept at the Jagiellonian Library in Krakow. The brief description of the linguistic traits leads to the determination of the place of origin of the manuscript. From the initial idea that the manuscript was made in Northern Italy, through the examination of orthographic, phonetic, morphologic and lexical features, I arrive at the conclusion that the codex must have been written in Veneto, and more precisely in central Veneto, maybe in or near Padua. The language itself may be described as the expression of the “koiné di terraferma”, a very characteristic Venetian variety of the 15th century that combined local and Tuscan characteristics.