What is Cosimo I de' Medici, Grand Duke of Tuscany?
{{Infobox royalty | name = Cosimo I de' Medici | image = Agnolo Bronzino - Cosimo I de' Medici in armour - Google Art Project.jpg | caption = Cosimo I in Armour by ''Agnolo Bronzino''. | spouse = Eleanor of Toledo<br>Camilla Martelli |succession = [[Duke of Florence]] |reign = 1537-1569 |predecessor = Alessandro I |successor = himself as Grand Duke |succession1 = [[List of rulers of Tuscany|Grand Duke of Tuscany]] |reign1 = 1569-1574 |predecessor1 = himself as Duke |successor1 = [[Francesco I de' Medici, Grand Duke of Tuscany|Francesco I]] | issue = [[Bia de' Medici]]<br>Princess Maria<br>[[Francesco I de' Medici, Grand Duke of Tuscany|Francesco I, Grand Duke of Tuscany]] <br>Isabella, Duchess of Bracciano<br>Cardinal Giovanni<br>Lucrezia, Duchess of Modena<br>Prince Pedricco<br>Prince Garzia<br>[[Ferdinando I de' Medici, Grand Duke of Tuscany|Ferdinando I, Grand Duke of Tuscany]]<br>Princess Anna<br>Prince Pietro<br>Virginia, Duchess of Modena | full name = | house = [[Medici]] | father = Giovanni dalle Bande Nere | mother = Maria Salviati | birth_date = {{birth date|1519|6|12|df=y}} | birth_place = [[Florence]], Republic of Florence | death_date = {{death date and age|1574|4|21|1519|6|12|df=y}} | death_place = ''[[Palazzo Pitti]]'' [[Florence]], [[Grand Duchy of Tuscany]] |}} '''Cosimo I de' Medici''' (12 June 1519 – 21 April 1574) was [[Duke of Florence]] from 1537 to 1574 and then the first [[Medici]] [[Grand Duke of Tuscany]] from 1569. He was the son of [[Giovanni dalle Bande Nere]] and [[Maria Salviati]]. ==Marriage and family== In 1539, he married [[Eleonora di Toledo]] (1522–1562). She died, with her sons Giovanni and Garzia, in 1562, aged forty. All three of them died from [[malaria]] while traveling to [[Pisa]]. Before his first marriage, Cosimo fathered an illegitimate daughter with an unknown woman: *[[Bia de' Medici]] (1536 – 1 March 1542) died in infancy. With Eleonora, Cosimo fat