William Cavendish, 1st Duke of Devonshire (25 January, 1640–18 August, 1707) was a soldier and statesman. A Whig under Charles II of England and James II of England, he was leader of the anti-court and anti-Romanist party in the House of Commons. He was a strong supporter of the "Glorious Revolution" of 1688 which brought William of Orange to the throne. After the revolution, he was a leading Whig, serving as William's Lord Steward, and was created the Duke of Devonshire (1694) and also Marquess of Hartington in recognition for his services. He was married to Lady Mary Butler (1646-1707), daughter of the 1st Duke of Ormonde, of Kilkenny Castle. He was also a famous womaniser.