Description: (Elector of Brandenburg and Duke of Prussia)
Frederick William, also known as "the Great Elector," ruled Brandenburg and Prussia from 1640 to 1688. He was a key figure in strengthening Prussia's military and political power, earning him his notable title. As a strong advocate of the Calvinist faith, he focused on enhancing trade and implementing reforms that boosted Prussia's influence in Northern-Central Europe. His initiatives paved the way for Prussia's transformation from a duchy to a kingdom during his son's reign.