Mona Lisa
The painting is thought to be a portrait of Lisa Gherardini, the wife of Francesco del Giocondo, and is in oil on a white Lombardy poplar panel. It had been believed to have been painted between 1503 and 1506; however, Leonardo may have continued working on it as late as 1517. Recent academic work suggests that it would not have been started before 1513. It was acquired by King Francis I of France and is now the property of the French Republic, on permanent display at the Louvre Museum in Paris since 1797.
Isleworth Mona Lisa
In 1913 English connoisseur Hugh Blaker spotted and acquired the painting which had been hanging for over a century in a manor house in Somerset, having been bought in Italy as an original Leonardo. In a monograph published shortly thereafter, Blaker's stepfather, John R Eyre, proposed that two versions of the Mona Lisa had been worked on by Leonardo; the "Isleworth" picture (named after the location of Blaker's studio in Isleworth, west London) being the first.