The mystery of Mona Lisa's smile indicated in the famous portrait of Leonardo da Vinci finally revealed. German academics feel confident they have managed to solve the mystery that has lasted several centuries behind the identity of a beautiful girl who becomes the object of his famous paintings.

Lisa Gherardini, the wife of a wealthy businessman Florence, Francesco del Giocondo, has long been regarded as the most likely model for the painting of the 16th century. However, art historians have often wondered whether the smiling woman may actually da Vinci's lover, his mother or the artist himself.

Now the experts at the Heidelberg University library said based on the written record of the owner in a book on the certainty obtained in October 1503 and for all that Lisa del Giocondo was indeed the model in the painting, which is one of the world-famous portrait paintings. "All doubts about the identity of the Mona Lisa have been dashed following the discovery by Dr.. Armin Schlechter, "a manuscript expert, the library said in a statement.

Until now, only be obtained "inconclusive evidence" from sixteenth-century documents. "This creates room for various interpretations and there are many different identities put forward," said library. The notes were made by Agostino Vespucci, an official and friend of da Vinci Florence, collection of letters written in the Roman orator, Cicero. Posts in Leonardo's notes compares with the ancient Greek artist Apelles and stated he was working on three paintings, one of which is a portrait of Lisa del Giocondo.

The art experts, who have years of making the painting linked to the medieval era, stating that the Heidelberg discovery is a breakthrough and the previous mention linking the merchant's wife with the portrait painting. "There's no reason to continue to doubt that this is a portrait of another woman," Leipzig University art historian said, Frank Zoelner, told German radio.