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Cosimo I de' Medici
Duke of Florence later Grand Duke of Tuscany (–)
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Cosimo 1 de medici biography channel
For the founder of the Medici dynasty, see Cosimo de' Medici.
Cosimo I de' Medici (12 June &#; 21 April ) was the second and last duke of Florence from until , 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 conquered Siena to consolidate Florence's rule in Tuscany. He expanded the Pitti Palace and most of the Boboli Gardens were also laid out during his reign.
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Life
Rise to power
Cosimo was born in Florence on 12 June , the son of the famous condottiere Ludovico de' Medici (known as Giovanni delle Bande Nere) and his wife Maria Salviati, herself a granddaughter of Lorenzo the Magnificent.
He was the grandson of Caterina Sforza, the Countess of Forlì and Lady of Imola. Cosimo became Duke of Florence in at age 17, after the former Duke