1551 Maria de' Medici by Agnolo Bronzino (Uffizi)
This is not the Marie de Medici of Louis XIII and Reubens fame. The Web Gallery of Art has this about her: "First-born of Cosimo I de' Medici and Eleonora di Toledo, Maria was born in 1540 and died in 1557 at the age of seventeen. The picture is datable around 1551 as is mentioned in letter written in that year by Bronzino to Cosimo I. Once again the painter realized a portrait psychologically closed emphasizing just nobility, beauty and dignity of the person."