What duchy was founded in 1530 following the actions of the ruler of the Holy Roman Empire at that time?
Duchy of Florence The Duchy of Florence (Italian: "Ducato di Firenze" ) was an Italian principality that was centred on the city of Florence, in Tuscany, Italy. The duchy was founded after Emperor Charles V restored Medici rule to Florence in 1530. Pope Clement VII, himself a Medici, appointed his relative Alessandro de' Medici as Duke of the Florentine Republic, thereby transforming the Republic of Florence into a hereditary monarchy.
Frederick III, Elector Palatine Frederick III of Simmern, the Pious, Elector Palatine of the Rhine (February 14, 1515 – October 26, 1576) was a ruler from the house of Wittelsbach, branch Palatinate-Simmern-Sponheim. He was a son of John II of Simmern and inherited the Palatinate from the childless Elector Otto-Henry, Elector Palatine ("Ottheinrich") in 1559. He was a devout convert to Calvinism, and made the Reformed confession the official religion of his domain by overseeing the composition and promulgation of the Heidelberg Catechism. His support of Calvinism gave the German Reformed movement a foothold within the Holy Roman Empire.