Conquests of Cosimo I
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Expansion during the rule of Cosimo I in the Duchy of Florence .
Chronology
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January 1555: The Florentines occupied the northern part of the Republic of Siena.
April 1555: The city of Siena surrenders to the Florentine army. The nobility of Siena flees to Montalcino.
August 1569: Olivola Marquisate entered the Grand Duchy of Tuscany.
January 1549: Since 1548, Cosimo had also been in occupation of the Lordship of Piombino (including Elba).
March 1549: The emperor granted the feud to Pietro Francesco and Leonardo de Nocetis, who in turn sold it to Cosimo I de' Medici. According to other sources, the transfer took place by contract from the Marquis Bernabò Manfredi to Cosimo I on March 17, 1549 reserving feudal rights.
Was a war of the Duchy of Florence (which controlled northern Tuscany), supported by Spanish and Imperial forces, against the Republic of Siena (which controlled southern Tuscany). The Republic of Siena was invaded and annexed by Florence.
