General John Churchill, 1st Duke of Marlborough, 1st Prince of Mindelheim, 1st Count of Nellenburg, Prince of the Holy Roman Empire, (26 May 1650 – 16 June 1722 O.S.) was a British army officer and statesman. From a gentry family, he served as a page at the court of the House of Stuart under James, Duke of York, through the 1670s and early 1680s, earning military and political advancement through his courage and diplomatic skill. He is known for never having lost a battle.
Churchill's role in defeating the Monmouth Rebellion in 1685 helped secure James on the throne, but he was a key player in the military conspiracy that led to James being deposed during the Glorious Revolution. Rewarded by William III with the title Earl of Marlborough, persistent charges of Jacobitism led to his fall from office and temporary imprisonment in the Tower of London.