The Dukes of Cleves were rulers of the Duchy of Cleves, located in present-day Germany. The duchy emerged in the 14th century and became significant during the Renaissance. The most notable duke was John III, who was known for his political alliances and efforts to strengthen the region. The dukes played a crucial role in the politics of the Holy Roman Empire and were connected to the House of Hohenzollern. Their influence extended through marriages, including the marriage of Anne of Cleves to Henry VIII of England, which highlighted their prominence in European affairs.