The Duke of Marlborough is a title in the British peerage, first created in 1702 for John Churchill, a prominent military leader. He is best known for his role in the War of the Spanish Succession, where he achieved significant victories against French forces, notably at the Battle of Blenheim in 1704. His military successes earned him great fame and respect in England and across Europe. The title has been passed down through generations, with several Dukes of Marlborough following John Churchill. The family seat is Blenheim Palace, a UNESCO World Heritage Site, which was built to honor the Duke's achievements. The current Duke, as of 2023, is Charles James Spencer-Churchill.