Born on 24 January 1547 in Prague, her marriage to Francesco de' Medici, heir of the Grand Duke of Tuscany, took place on 18 December 1565 in Florence. Johanna, as pale, thin and charmless as Francesco, was miserably homesick. Ill and unhappy, ignored by her husband, and condemned by the Florentines for her Austrian hauteur, she never felt at home in Florence. 
In his way her father-in-law was kind to her. He had the courtyard of the Palazzo Vecchio specially decorated for her; the lunettes were painted with murals of Austrian towns by pupils of Vasari, and Verocchio's gay fountain of the little urchin with a spouting fish was brought down from the Careggi villa where it had 
been set up in the garden by Lorenzo il Magnifico. 
In twelve years of marriage, she gave birth to eight children; then, on 10 April 1578 aged only thirty-one, she died in Florence. Francesco then married his mistress, Bianca Capello. 
 

 "The Rise and Fall of The House of Medici", by Christopher Hibbert.