Isleworth Mona Lisa
According to Leonardo's early biographer Giorgio Vasari, Leonardo had started to paint "Mona Lisa" in 1503, but "left it unfinished". However, a fully finished painting of a "certain Florentine lady" surfaced again in 1517, shortly before Leonardo's death and in his private possession. The latter painting almost certainly is the one that now hangs in the Louvre. Based on this contradiction, supporters of the authenticity of the "Isleworth Mona Lisa" claim it is the unfinished "Mona Lisa", made at least partially by Leonardo, and the Louvre "Mona Lisa" a later version of it, made by Leonardo for his own use.
French Renaissance
In 1516, Francis I of France invited Leonardo da Vinci to the Château d'Amboise and provided him with the Château du Clos Lucé, then called Château de Cloux, as a place to stay and work. Leonardo, a famous painter and inventor, arrived with three of his paintings, namely the "Mona Lisa", "Sainte Anne", and "Saint Jean Baptiste", today owned by the Louvre museum of Paris.