Ferdinando I de ' Medici , Grand Duke of Tuscany ( 30 July 1549 - 17 February 1609 ) was Grand Duke of Tuscany from 1587 to 1609 , having succeeded his older brother Francesco I. Ferdinando was the fifth son ( the third surviving at the time of his birth ) of Cosimo I de ' Medici , Grand Duke of Tuscany and Eleonora di Toledo , the daughter of Don Pedro Alvarez de Toledo , the Spanish viceroy of Naples .
Ferdinando I de ' Medici , Grand Duke of Tuscany ( 30 July 1549 - 17 February 1609 ) was Grand Duke of Tuscany from 1587 to 1609 .