The Columbia Encyclopedia, Sixth Edition. 2001-07.
Medici, Cosimo III de
16421723, grand duke of Tuscany (16701723); 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.