Researchers in Italy claim to have unearthed the portrait of a noblewoman by Leonardo da Vinci which has been lost for 500 years and features the same enigmatic smile as his Mona Lisa.
The portrait of Isabella d'Este, Marquess of Mantua, which carbon dating suggests was painted around the start of the 16th century, has been found in a vault in a private collection in Switzerland, and has been verified by a leading authority on the renaissance polymath.