Giovanni Battista di Jacopo (8 March 1495 in Gregorian style, or 1494 according to the calculation of times in Florence where the year began on 25 March – 14 November 1540), known as Rosso Fiorentino (meaning "red Florentine" in Italian), or Il Rosso, was an Italian Mannerist painter, in oil and fresco, belonging to the Florentine school.