Republic of Florence
The Duca della Repubblica Fiorentina, rendered in English as Duke of the Florentine Republic or Duke of the Republic of Florence, was a title created in 1532 by Pope Clement VII for the Medici family (his own family), which ruled the Republic of Florence. There were effectively only two dukes of the Republic of Florence, Alessandro de' Medici and Cosimo de' Medici, the second duke being elevated to Grand Duke of Tuscany, causing the Florentine title to become subordinate to the greater Tuscan title.