Medici, Cosimo III de'
Medici, Cosimo III de', 1642–1723, grand duke of Tuscany (1670–1723); son and successor of Ferdinand II de' Medici . During his long reign the government of Tuscany degenerated into bigoted and corrupt despotism. His son and successor, Gian Gastone de' Medici , was the last of the family to rule Tuscany.
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