Cosimo I de’ Medici
Cosimo I de’ Medici (Florence, June 12, 1519 – April 21, 1574) was Duke of Florence and later, the first Grand Duke of Tuscany. He ruled from 1537 to 1574.
Son of the mercenary captain Giovanni dalle Bande Nere and of Maria Salviati, Cosimo came to power in 1537 at the young age of seventeen.