Gian Gastone de’ Medici (Giovanni Battista Gastone; 24 May 1671 – 9 July 1737) was the seventh and last Medicean Grand Duke of Tuscany. He was the second son of Cosimo III de’ Medici, Grand Duke of Tuscany, and Marguerite Louise d’Orléans, Princess of France. His sister, Anna Maria Luisa de’ Medici, the Electress Palatine, married him to Anna Maria Franziska of Saxe-Lauenburg, a wealthy widow, in 1697. Unfortunately, Gian Gastone despised his new wife, and she, him. The union produced no offspring.