House of Lorraine upon Gian Gastone's death in 1737. Issue Cosimo III had three children with Marguerite Louise d'Orléans, a granddaughter of Henry IV of France: Ferdinando de' Medici, Grand Prince of Tuscany (b.1663 d.1713) married Violante Beatrice of Bavaria, no issue; Anna Maria Luisa de' Medici, Electress Palatine (b.1667 d.1743) married Johann Wilhelm, Elector Palatine, no issue; Gian Gastone de' Medici, Grand Duke of Tuscany (b.1671 d.1737) married Anna Maria Franziska of Saxe-Lauenburg, no issue. Cosimo did not enjoy a harmonious relationship with his elder son, Ferdinando. They disagreed about Cosimo's bigoted ideology and his monthly allowance. Cosimo married him to a Bavarian princess, Violante Beatrice. This union was exceedingly discontent, and produced no offspring. Anna Maria Luisa was the Grand Duke's favourite child. She married Johann Wilhelm, Elector Palatine, and like her brother, had no issue. Gian Gastone, Cosimo's eventual successor, despised his father and his court. Anna Maria Luisa arranged for him to marry Anna Maria Franziska of Saxe-Lauenburg, a union that produced no children. Honours 23 May 167031 October 1721: Grand Master of the Holy Military Order of St. Stephen Pope and Martyr Ancestors Citations Bibliography Acton, Harold: The Last Medici, Macmillan, London, 1980, Strathern, Paul: The Medici: Godfathers of the Renaissance, Vintage books, London, 2003, Hale, J. R.: Florence and the Medici, Orion books, London, 1977, van de Wetering, Ernst: Rembrandt: The Painter at Work, Amsterdam University Press, Amsterdam, 1997 Setton, Kenneth M.: Western Hostility to Islam and Prophecies of Turkish Doom'', Amer Philosophical Society, 1992, External links Timeline of the events of Cosimo III's reign by Google 1642 births 1723 deaths Cosimo 3 Cosimo 3 Nobility from Florence Cosimo 3 17th-century Italian nobility 18th-century Italian nobility Burials at San Lorenzo, Florence