Cosimo I de' Medici, Grand Duke of Tuscany (born 1519)

Cosimo I de' Medici

Duke of Florence later Grand Duke of Tuscany (1537–1574)

Cosimo I de' Medici was the second and last duke of Florence from 1537 until 1569, when he became the first grand duke of Tuscany, a title he held until his death. Cosimo I succeeded his cousin to the duchy. He built the Uffizi (office) to organize his administration, and…