 Isabella of Aragon, Cecilia Gallerani, Costanza d'Avalos, Duchess of Francavilla, Isabella d'Este, Pacifica Brandano or Brandino, Isabela Gualanda, Caterina Sforza, Bianca Giovanna Sforza—even Salaì and Leonardo himself—are all among the list of posited models portrayed in the painting.The consensus of art historians in the 21st century maintains the long-held traditional opinion that the painting depicts Lisa del Giocondo.Leonardo da Vinci had begun working on a portrait of Lisa del Giocondo, the model of the "Mona Lisa", by October 1503.