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 successes helped to establish Britain as a major European power. The title has been passed down through generations, with several Dukes contributing to British history. The Blenheim Palace, a UNESCO World Heritage Site, was built to honor John Churchill's military achievements and remains a symbol of his legacy.