Medici, Cosimo I de

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Medici, Cosimo I de' ( the Great) (1519–74) Duke of Florence (1537–74), Grand Duke of Tuscany (1569–74). Under Cosimo's authoritarian rule, Florence flourished and its territory swelled with the acquisition of Siena. He was given the title of Grand Duke by the Pope.

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Medici, Cosimo I de