John Sholto Douglas, 9th Marquess of Queensberry (20 July 1844 31 January 1900), was a British nobleman, remembered for his atheism, his outspoken views, his brutish manner, for lending his name to the "Queensberry Rules" that form the basis of modern boxing, and for his role in the downfall of the Irish author and playwright Oscar Wilde.

Oscar Fingal O'Flahertie Wills Wilde (16 October 1854 – 30 November 1900) was an Irish poet and playwright. After writing in different forms throughout the 1880s, he became one of the most popular playwrights in London in the early 1890s. He is best remembered for his epigrams and plays, his novel The Picture of Dorian Gray, and the circumstances of his criminal conviction for gross indecency for consensual homosexual acts in "one of the first celebrity trials", imprisonment, and early death from meningitis at age 46.

Wilde's parents were Anglo-Irish intellectuals in Dublin. A young Wilde learned to speak fluent French and German. At university, Wilde read Greats; he demonstrated himself to be an exceptional classicist, first at Trinity College Dublin, then at Oxford. He became associated with the emerging philosophy of aestheticism, led by two of his tutors, Walter Pater and John Ruskin. After university, Wilde moved to London into fashionable cultural and social circles.

As a spokesman for aestheticism, he tried his hand at various literary activities: he published a book of poems, lectured in the United States and Canada on the new "English Renaissance in Art" and interior decoration, and then returned to London where he worked prolifically as a journalist. Known for his biting wit, flamboyant dress and glittering conversational skill, Wilde became one of the best-known personalities of his day. At the turn of the 1890s, he refined his ideas about the supremacy of art in a series of dialogues and essays, and incorporated themes of decadence, duplicity, and beauty into what would be his only novel, The Picture of Dorian Gray (1890). The opportunity to construct aesthetic details precisely, and combine them with larger social themes, drew Wilde to write drama. He wrote Salome (1891) in French while in Paris but it was refused a licence for England due to an absolute prohibition on the portrayal of Biblical subjects on the English stage. Unperturbed, Wilde produced four society comedies in the early 1890s, which made him one of the most successful playwrights of late-Victorian London.

At the height of his fame and success, while The Importance of Being Earnest (1895) was still being performed in London, Wilde prosecuted the Marquess of Queensberry for criminal libel. The Marquess was the father of Wilde's lover, Lord Alfred Douglas. The libel trial unearthed evidence that caused Wilde to drop his charges and led to his own arrest and trial for gross indecency with men. After two more trials he was convicted and sentenced to two years' hard labour, the maximum penalty, and was jailed from 1895 to 1897. During his last year in prison, he wrote De Profundis (published posthumously in 1905), a long letter which discusses his spiritual journey through his trials, forming a dark counterpoint to his earlier philosophy of pleasure. On his release, he left immediately for France, and never returned to Ireland or Britain. There he wrote his last work, The Ballad of Reading Gaol (1898), a long poem commemorating the harsh rhythms of prison life.