Del Giocondo was first named as the likeness in the painting by Italian writer Giorgio Vasari in 1550, who also dated the work at between 1503 and 1506, the university said.

• 据海德堡大学介绍，意大利作家乔治亚?瓦萨尼曾于1550年得出类似结论，同时他也认为《蒙娜丽莎》创作于1503年至1506年间。