Ludovico Sforza
According to Kemp and Cotte, the association with the "Sforziada" suggests that the drawing is a portrait of Bianca Sforza, who was the daughter of Ludovico Sforza and his mistress Bernardina de Corradis. At the time of the portrait, she was around thirteen years old. Leonardo painted three other portraits associated with the family or court of Ludovico Sforza.