Douglas was born at Ham Hill House in Powick, Worcestershire, the third son of John Douglas, 9th Marquess of Queensberry and his first wife, Sibyl Montgomery. See more

With Douglas's avid support, but against the advice of friends such as Robbie Ross, Frank Harris and George Bernard Shaw, Wilde had Queensberry arrested and charged with criminal libel in a private prosecution, as sodomy was then a criminal offence. … See more

After Wilde's death, Douglas made a close friendship with Olive Custance, a bisexual heiress and poet. They married on 4 March 1902. Olive Custance was in a relationship with the writer Natalie Barney when she and Douglas first met. Barney and Douglas … See more

In 1920 Douglas founded a right-wing, Catholic, and deeply antisemitic weekly magazine called Plain English, in which he collaborated with Harold Sherwood Spencer and … See more

In 1891, Douglas's cousin Lionel Johnson introduced him to Oscar Wilde; they soon began an affair. In 1894, the Robert Hichens novel The Green Carnation was published, a roman à clef depicting satirically Douglas's dependent relationship on Wilde. See more

The meeting in Rouen was disapproved of by the friends and families of both men. During the later part of 1897, Wilde and Douglas lived together in Naples, but they separated due to … See more

In 1911, Douglas embraced Catholicism as Wilde had done earlier. More than a decade after Wilde's death, with the release of suppressed portions of Wilde's De Profundis letter in 1912, Douglas turned against his former friend, whose homosexuality he … See more