Vasari's account of the Mona Lisa comes from his biography of Leonardo published in 1550, 31 years after the artist's death, and which has long been the best known source of information on the provenance of the work and identity of the sitter. Leonardo's assistant Salaì, at his death in 1525, owned a portrait which in his personal papers was named la Gioconda, a painting bequeathed to him by Leonardo. That Leonardo painted such a work, and its date, were confirmed in 2005 when a scholar at Heidelberg University discovered a marginal note in a 1477 printing of a volume written by the ancient Roman philosopher Cicero. The note is dated October 1503 and was written by Leonardo's contemporary Agostino Vespucci. This note likens Leonardo to renowned Greek painter Apelles, who is mentioned in the text, and states that Leonardo was at that time working on a painting of Lisa del Giocondo.[7]
A margin note by Agostino Vespucci (visible at right) discovered in a book at Heidelberg University, dating to 1503, states that Leonardo was working on a portrait of Lisa del Giocondo.
The sitter, Lisa del Giocondo,[8][9] was a member of the Gherardini family of Florence and Tuscany, and the wife of wealthy Florentine silk merchant Francesco del Giocondo.[10] The painting is thought to have been commissioned for their new home, and to celebrate the birth of their second son, Andrea.[11] The Italian name