Cosimo I de' Medici, Grand Duke of Tuscany

Cosimo I de' Medici (12 June 1519 – 21 April 1574) was the second Duke of Florence from 1537 until 1569, when he became the first Grand Duke of Tuscany.

Life

Rise to power

Cosimo was born in Florence, on 12 June 1519, the son of the famous condottieri Giovanni dalle Bande Nere from Forlì and Maria Salviati. Cosimo came to power at 17, when the 26-year-old Duke, Alessandro de' Medici, was assassinated in 1537, as Alessandro's only male child was illegitimate. Cosimo was from a different branch of the family, and so far had lived in Mugello, and was almost unknown in Florence: however, many of the influential men in the city favored him, several of them hoping to rule through him and thereby enrich themselves at the state's expense. However, as Benedetto Varchi famously put it "The innkeeper's reckoning was different from the glutton's." Cosimo proved strong-willed, astute and ambitious, and soon rejected the clause he had signed, which entrusted much of the power to a council of Forty-Eight.