Marquis de Sade

Donatien Alphonse François de Sade, Marquis de Sade, (PROSE: The Man in the Velvet Mask) also known as Prisoner 6 or Monsieur le 6, was a French nobleman. (PROSE: The Adventuress of Henrietta Street, The Man in the Velvet Mask)

During the Reign of Terror he was imprisoned in the Vincennes prison, where he was labelled "Prisoner 6". He narrowly survived prison, as his execution was postponed due to a clerical error, and in the interim the Reign was overthrown. His books included Justine, (PROSE: The Man in the Velvet Mask) The 120 Days of Sodom, (PROSE: The Adventuress of Henrietta Street) Aline et Valcour, and Juliette. (PROSE: The Man in the Velvet Mask)

River Song claimed to have escaped from his private boudoir. (AUDIO: The Sonomancer)

claimed she had been engaged to him. (AUDIO: Divorced, Beheaded, Regenerated)

The Marquis de Sade was ultimately imprisoned again in Charenton Asylum, where he directed plays for the inmates. (PROSE: The Man in the Velvet Mask) In 1805, Juliette Vierge visited an inmate at Charenton before she disappeared from history. (PROSE: The Adventuress of Henrietta Street) He ultimately died in the asylum. (PROSE: The Man in the Velvet Mask)

Other realities
In the alternate Paris of the World Machine, the Marquis de Sade was imprisoned in the Bastille in 1804. He could not remember who he was, and Minski had replaced him with a clockwork duplicate. (PROSE: The Man in the Velvet Mask)