Question: When was Isabella De' Medici's father born?
Sentence (from "Cosimo I de' Medici, Grand Duke of Tuscany"): Cosimo I de' Medici( 12 June 1519 – 21 April 1574) was the second Duke of Florence from 1537 until 1569, when he became the first Grand Duke of Tuscany, a title he held until his death.
Relevant evidence: Yes