 Giorgio Vasari's "Lives of Artists" describes the painting as having thick eyebrows; however, while this may mean that the eyebrows and lashes were accidentally removed, it could also mean that Vasari did not have first-hand knowledge of the work.Although the sitter has traditionally been identified as Lisa del Giocondo, a lack of definitive evidence has long fueled alternative theories.During the last years of his life, Leonardo spoke of a portrait "of a certain Florentine lady done from life at the request of the magnificent Giuliano de' Medici."