John Sholto Douglas, 9th Marquess of Queensberry (1844-1900), was a Scottish nobleman known for his involvement in the world of boxing. He is best remembered for the Queensberry Rules, a set of regulations that established fair play and safety standards in the sport, which are still in use today. Queensberry was also notable for his tumultuous personal life, including his marriage to Catherine Douglas and his relationship with the playwright Oscar Wilde. His public disputes and legal battles, particularly with Wilde, brought significant attention to his life and contributed to his legacy in both sports and social history.