peer reviewed ; The Descrittione di tutti i Paesi Bassi by Lodovico Guicciardini (Antwerp, 1567) includes a digression on Flemish artists, where the author refers with great respect to Giorgio Vasari’s Vite (Florence, 1550), while adding a considerable amount of new data based on first-hand observations. Indeed, besides the small list of Netherlandish artists mentioned by Vasari, Guicciardini cites eighty more, which reflects an extensive survey of the subject. In the second edition of his Vite (Florence, 1568), Vasari includes in turn the artists listed by Guicciardini in an appendix entitled Diversi artifice fiamminghi. However, he patently omits to acknowledge Guicciardini as his main source. A close examination of his borrowings reveals changes in the order of the data, paraphrases, and misleading references, i.e. practices commonly used by unscrupulous copyists. If this plagiarism has not yet been identified as such, it is because Vasari made sure to cover his tracks. Moreover, it raises questions as to Lodovico Guicciardini’s reception among his Florentine compatriots at that time.