Medici, Gian Gastone de'

Medici, Gian Gastone de'

(jän gästô`nā dā mĕ`dĭchē, Ital. mā`dēchē), 1671–1737, grand duke of Tuscany (1723–37); son and successor of Cosimo III de' Medici. Gian Gastone was the last male member of his family, and the question of succession caused agitation from 1715 onward. In 1735 it was settled, in connection with the general territorial exchanges caused by the War of the Polish SuccessionPolish Succession, War of the,
1733–35. On the death (1733) of Augustus II of Poland, Stanislaus I sought to reascend the Polish throne. He was supported by his son-in-law, Louis XV of France.
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, that on Gian Gastone's death Tuscany should fall to Francis of Lorraine (later Holy Roman Emperor Francis IFrancis I,
1708–65, Holy Roman emperor (1745–65), duke of Lorraine (1729–37) as Francis Stephen, grand duke of Tuscany (1737–65), husband of Archduchess Maria Theresa.
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), husband of Maria Theresa of Austria, in exchange for Lorraine, which went to Stanislaus I of Poland. When Francis became grand duke, Tuscany had fallen from its former glory to decadence and impoverishment.