 If the subject is Bianca Sforza it would date from 1496, the year of her marriage and her death.Reflecting the subject of an Italian woman of high nobility, Kemp named the portrait "La Bella Principessa", although acknowledging that Sforza ladies were not princesses.If the drawing is originally a Leonardo illustration for the present-day Warsaw copy of the "Sforziad", its history is the same as that of the book until the drawing was cut out from the volume.